diff --git a/workflow/rules/cram_variantCalling-Discovery.smk b/workflow/rules/cram_variantCalling-Discovery.smk
new file mode 100644
index 0000000..0d96844
--- /dev/null
+++ b/workflow/rules/cram_variantCalling-Discovery.smk
@@ -0,0 +1,104 @@
+CHROMS=list(range(1, 23))
+CHROMS.extend(['X'])
+
+# conditional statement in sequenceChrStringCheck.smk to either proceed with 1 or add "chr" for "chr1"
+rule check_for_chr_string:
+	input:
+		SMP = "results/cram/{sample}.cram",
+	output:
+		ChrStrCheck="results/vcf/{sample}/chrStrCheck/alignmentFileHeader.out",
+	params:
+		sample=lambda wc: wc.get("sample"),
+	resources:
+		mem_mb=1500,
+		runtime="00:10:00",
+	benchmark:
+		repeat("benchmarks/check_for_chr_string.{sample}.RawSeq", 1)
+	script:
+		"../scripts/chr-string-check-cram.py"
+
+rule cram_variant_calling:
+	input:
+		cram="results/cram/{sample}.cram",
+		cramIndex="results/cram/{sample}.cram.crai",
+		ref = which_ref,
+		chrStrCheck="results/vcf/{sample}/chrStrCheck/alignmentFileHeader.out",
+		regions=CHROMS,
+	output:
+		splitChrVCF="results/vcf/{sample}/chr{chroms}.vcf.gz",
+	params:
+		sample=lambda wc: wc.get("sample"),
+		chroms_from_wc=lambda wc: wc.get("chroms"),
+		extra_mpileup=get_variant_calling_mpileup_params,
+		extra_call=get_variant_calling_call_params,
+		extra_NormTrueFalse=get_NormTrueFalse,
+		extra_normalize=get_NormLeftAlign,
+	resources:
+		mem_mb=3500,
+		runtime="24:00:00",
+	benchmark:
+		repeat("benchmarks/cram_variant_calling.{sample}.chr{chroms}.StoredSequence", 1)
+	script:
+		"../scripts/cram-variant-calling-discovery.py"
+
+
+rule variant_calling_index:
+	input:
+		ChrVCF="results/vcf/{sample}/chr{chroms}.vcf.gz",
+	output:
+		ChrTBI="results/vcf/{sample}/chr{chroms}.vcf.gz.tbi",
+	resources:
+		mem_mb=1500,
+		runtime="00:30:00",
+	benchmark:
+		repeat("benchmarks/variant_calling_index.{sample}.chr{chroms}.StoredSequence", 1)
+	shell:
+		"""
+		bcftools index --tbi {input.ChrVCF} -o {output.ChrTBI}
+		"""
+
+
+rule merge_sample_chrom_list:
+	input:
+		concatChrVCF=expand("results/vcf/{sample}/chr{{chroms}}.vcf.gz", sample=cramSamples["cramSample"]),
+		concatChrTBI=expand("results/vcf/{sample}/chr{{chroms}}.vcf.gz.tbi", sample=cramSamples["cramSample"]),
+	output:
+		mergeList="results/vcf/chr{chroms}-merge-sampleList.txt",
+	resources:
+		mem_mb=200,
+		runtime="00:10:00",
+	benchmark:
+		repeat("benchmarks/merge_sample_chrom_list.chr{chroms}.StoredSequence", 1)
+	script:
+		"../scripts/merge-sample-chrom-list-discovery.py"
+
+rule merge_samples_per_chrom:
+	input:
+		mergeList="results/vcf/chr{chroms}-merge-sampleList.txt",
+	output:
+		mergeChrVCF="results/vcf/Merged-chr{chroms}-allSamples.vcf.gz",
+	params:
+		chroms_from_wc=lambda wc: wc.get("chroms"),
+	resources:
+		mem_mb=10000,
+		runtime="00:10:00",
+	benchmark:
+		repeat("benchmarks/merge_samples_per_chrom.chr{chroms}.StoredSequence", 1)
+	script:
+		"../scripts/merge-sample-chroms.py"
+
+
+rule merge_samples_per_chrom_index:
+	input:
+		mergeChrVCF="results/vcf/Merged-chr{chroms}-allSamples.vcf.gz",
+	output:
+		mergeChrTBI="results/vcf/Merged-chr{chroms}-allSamples.vcf.gz.tbi",
+	resources:
+		mem_mb=1500,
+		runtime="00:30:00",
+	benchmark:
+		repeat("benchmarks/merge_samples_per_chrom_index.chr{chroms}.StoredSequence", 1)
+	shell:
+		"""
+		bcftools index --tbi {input.mergeChrVCF} -o {output.mergeChrTBI}
+		"""
diff --git a/workflow/rules/variantCalling-Discovery.smk b/workflow/rules/variantCalling-Discovery.smk
new file mode 100644
index 0000000..cf25ae2
--- /dev/null
+++ b/workflow/rules/variantCalling-Discovery.smk
@@ -0,0 +1,102 @@
+CHROMS=list(range(1, 23))
+CHROMS.extend(['X'])
+
+# conditional statement in sequenceChrStringCheck.smk to either proceed with 1 or add "chr" for "chr1"
+rule check_for_chr_string:
+	input:
+		sortedBam="results/sortedBam/{sample}.sorted.bam",
+		bamIndex="results/sortedBam/{sample}.sorted.bam.bai",
+	output:
+		ChrStrCheck="results/vcf/{sample}/chrStrCheck/alignmentFileHeader.out",
+	params:
+		sample=lambda wc: wc.get("sample"),
+	resources:
+		mem_mb=1500,
+		runtime="00:10:00",
+	benchmark:
+		repeat("benchmarks/check_for_chr_string.{sample}.RawSeq", 1)
+	script:
+		"../scripts/chr-string-check-bam.py"
+
+
+rule variant_calling:
+	input:
+		sortedbam="results/sortedBam/{sample}.sorted.bam",
+		bamIndex="results/sortedBam/{sample}.sorted.bam.bai",
+		chrStrCheck="results/vcf/{sample}/chrStrCheck/alignmentFileHeader.out",
+		ref=which_ref,
+		regions=CHROMS,
+	output:
+		ChrVCF="results/vcf/{sample}/chr{chroms}.vcf.gz",
+	resources:
+		mem_mb=2500,
+		runtime="24:00:00",
+	params:
+		sample=lambda wc: wc.get("sample"),
+		extra_mpileup=get_variant_calling_mpileup_params,
+		extra_call=get_variant_calling_call_params,
+		extra_NormTrueFalse=get_NormTrueFalse,
+		extra_normalize=get_NormLeftAlign,
+	benchmark:
+		repeat("benchmarks/variant_calling.{sample}.chr{chroms}.RawSeq", 1)
+	script:
+		"../scripts/variant-calling-discovery.py"
+
+rule variant_calling_index:
+	input:
+		ChrVCF="results/vcf/{sample}/chr{chroms}.vcf.gz",
+	output:
+		ChrTBI="results/vcf/{sample}/chr{chroms}.vcf.gz.tbi",
+	resources:
+		mem_mb=1500,
+		runtime="06:00:00",
+	benchmark:
+		repeat("benchmarks/variant_calling_index.{sample}.chr{chroms}.RawSeq", 1)
+	shell:
+		"""
+		bcftools index --tbi {input.ChrVCF} -o {output.ChrTBI}
+		"""
+
+rule merge_sample_chrom_list:
+	input:
+		concatChrVCF=expand("results/vcf/{sample}/chr{{chroms}}.vcf.gz", sample=samples["sample"]),
+		concatChrTBI=expand("results/vcf/{sample}/chr{{chroms}}.vcf.gz.tbi", sample=samples["sample"]),
+	output:
+		mergeList="results/vcf/chr{chroms}-merge-sampleList.txt",
+	resources:
+		mem_mb=200,
+		runtime="00:10:00",
+	benchmark:
+		repeat("benchmarks/merge_sample_chrom_list.chr{chroms}.RawSeq", 1)
+	script:
+		"../scripts/merge-sample-chrom-list.py"
+
+rule merge_samples_per_chrom:
+	input:
+		mergeList="results/vcf/chr{chroms}-merge-sampleList.txt",
+	output:
+		mergeChrVCF="results/vcf/Merged-chr{chroms}-allSamples.vcf.gz",
+	params:
+		chroms_from_wc=lambda wc: wc.get("chroms"),
+	resources:
+		mem_mb=10000,
+		runtime="00:10:00",
+	benchmark:
+		repeat("benchmarks/merge_samples_per_chrom.chr{chroms}.RawSeq", 1)
+	script:
+		"../scripts/merge-sample-chroms.py"
+
+rule merge_samples_per_chrom_index:
+	input:
+		mergeChrVCF="results/vcf/Merged-chr{chroms}-allSamples.vcf.gz",
+	output:
+		mergeChrTBI="results/vcf/Merged-chr{chroms}-allSamples.vcf.gz.tbi",
+	resources:
+		mem_mb=1500,
+		runtime="00:30:00",
+	benchmark:
+		repeat("benchmarks/merge_samples_per_chrom_index.chr{chroms}.RawSeq", 1)
+	shell:
+		"""
+		bcftools index --tbi {input.mergeChrVCF} -o {output.mergeChrTBI}
+		"""
diff --git a/workflow/scripts/cram-variant-calling-discovery.py b/workflow/scripts/cram-variant-calling-discovery.py
new file mode 100644
index 0000000..536a51f
--- /dev/null
+++ b/workflow/scripts/cram-variant-calling-discovery.py
@@ -0,0 +1,127 @@
+from os import path
+from snakemake.shell import shell
+
+# Extract arguments.
+extra = snakemake.params.get("extra", "")
+extra_mpileup = snakemake.params.get("extra_mpileup", "")
+extra_call = snakemake.params.get("extra_call", "")
+extra_NormTrueFalse = snakemake.params.get("extra_NormTrueFalse", "")
+extra_normalize = snakemake.params.get("extra_normalize", "")
+
+sample = snakemake.params.get("sample", "")
+chromsWC = snakemake.params.get("chroms_from_wc", "")
+
+reference = snakemake.input.ref
+# comment block below if you have to add specific path to referene in cram_variantCalling.smk file
+# if isinstance(reference, str):
+# 	reference = path.splitext(snakemake.input.ref)[0]
+# else:
+# 	reference = path.splitext(snakemake.input.ref[0])[0]
+
+log = snakemake.log_fmt_shell(stdout=False, stderr=True)
+
+shell(
+	"mkdir -p results/vcf/{sample}/TempFiles/chr{chromsWC}"
+)
+
+def findSequenceName(Filename,Value):
+	with open(Filename) as f:
+		if Value in f.read(): # read if value is in file 
+			print('chr1 is present, thus, chr string exists')
+			print('Adding chr to NYGC regions file')
+			return True
+		else:
+			return False
+		f.close()
+
+Norm = extra_NormTrueFalse
+
+filename = snakemake.input.chrStrCheck
+value = 'SN:chr1'
+
+chrStrYes = findSequenceName(filename,value)
+
+if Norm == True:
+	if chrStrYes == True:
+		# keeps the chr string for "chr1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O u |"
+			" bcftools norm -f {reference}"
+			" {extra_normalize}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
+	elif chrStrYes == False:
+		# removes the chr string for "1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O u |"
+			" bcftools norm -f {reference}"
+			" {extra_normalize}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
+elif Norm == False:
+	if chrStrYes == True:
+		# keeps the chr string for "chr1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
+	elif chrStrYes == False:
+		# removes the chr string for "1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
diff --git a/workflow/scripts/merge-sample-chrom-list-discovery.py b/workflow/scripts/merge-sample-chrom-list-discovery.py
new file mode 100644
index 0000000..175ddc0
--- /dev/null
+++ b/workflow/scripts/merge-sample-chrom-list-discovery.py
@@ -0,0 +1,16 @@
+from os import path
+import re
+import tempfile
+from snakemake.shell import shell
+
+# Extract arguments.
+# extra = snakemake.params.get("extra", "")
+
+log = snakemake.log_fmt_shell(stdout=False, stderr=True)
+sed_arg = [ "sed 's/ /\\n/g'" ]
+
+shell(
+    "echo {snakemake.input.ChrVCF} |"
+    " {sed_arg} - > {snakemake.output.mergeList}"
+)
+
diff --git a/workflow/scripts/variant-calling-discovery.py b/workflow/scripts/variant-calling-discovery.py
new file mode 100644
index 0000000..536a51f
--- /dev/null
+++ b/workflow/scripts/variant-calling-discovery.py
@@ -0,0 +1,127 @@
+from os import path
+from snakemake.shell import shell
+
+# Extract arguments.
+extra = snakemake.params.get("extra", "")
+extra_mpileup = snakemake.params.get("extra_mpileup", "")
+extra_call = snakemake.params.get("extra_call", "")
+extra_NormTrueFalse = snakemake.params.get("extra_NormTrueFalse", "")
+extra_normalize = snakemake.params.get("extra_normalize", "")
+
+sample = snakemake.params.get("sample", "")
+chromsWC = snakemake.params.get("chroms_from_wc", "")
+
+reference = snakemake.input.ref
+# comment block below if you have to add specific path to referene in cram_variantCalling.smk file
+# if isinstance(reference, str):
+# 	reference = path.splitext(snakemake.input.ref)[0]
+# else:
+# 	reference = path.splitext(snakemake.input.ref[0])[0]
+
+log = snakemake.log_fmt_shell(stdout=False, stderr=True)
+
+shell(
+	"mkdir -p results/vcf/{sample}/TempFiles/chr{chromsWC}"
+)
+
+def findSequenceName(Filename,Value):
+	with open(Filename) as f:
+		if Value in f.read(): # read if value is in file 
+			print('chr1 is present, thus, chr string exists')
+			print('Adding chr to NYGC regions file')
+			return True
+		else:
+			return False
+		f.close()
+
+Norm = extra_NormTrueFalse
+
+filename = snakemake.input.chrStrCheck
+value = 'SN:chr1'
+
+chrStrYes = findSequenceName(filename,value)
+
+if Norm == True:
+	if chrStrYes == True:
+		# keeps the chr string for "chr1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O u |"
+			" bcftools norm -f {reference}"
+			" {extra_normalize}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
+	elif chrStrYes == False:
+		# removes the chr string for "1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O u |"
+			" bcftools norm -f {reference}"
+			" {extra_normalize}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
+elif Norm == False:
+	if chrStrYes == True:
+		# keeps the chr string for "chr1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+
+	elif chrStrYes == False:
+		# removes the chr string for "1"
+		shell(
+			"bcftools mpileup"
+			" -f {reference}"
+			" {extra_mpileup}"
+			" -r {snakemake.input.regions}"
+			" -O u"
+			" results/cram/{sample}.cram |"
+			" bcftools call"
+			" {extra_call}"
+			" -O u |"
+			" bcftools sort"
+			" -m 2G"
+			" -T results/vcf/{sample}/TempFiles/chr{chromsWC}"
+			" -O z"
+			" -o {snakemake.output.ChrVCF}"
+		)
+