Update data_exploration.ipynb

Author: mariaboulougouri

data_exploration.ipynb

@@ -141,8 +141,8 @@
    "metadata": {},
    "source": [
     "## Phenotype\n",
-    "The phenotype data corresponds to the results of different experiments. It is made of 2 files, one file contains the results and the other contains the description of the experiments (experiment type, authors,...).\n",
-    "In the result table, rows correspond to phenotypes and columns to mouse strains. The entries are float numbers. The table contains a large number of missing values as not all the mouse strains have been involved in all the experiments."
+    "For every BXD strain included in this study, fed with either chow diet (CD) or high fat diet (HFD), measurements describing the phenotype of 3-5 mice were taken. These include body weight and organ mass measurements, activity tests, and molecular measurements (eg. levels of Glucose/ proteins / lipids in blood). The results of these measurements are displayed in a table, with the phenotypes as rows, mouse strains as columns, and values as float numbers. It should be noted that these measurements are displayed in different units (eg. grams for weight, milligrams per liter for blood tests), and value ranges vary. As such, scaling may be advised for further analysis. Moreover, some mouse strains have not been involved in all measurements, resulting in a large number of missing values.\n",
+    "Further information on each phenotype, such as unit of measurement, or associated publication, can be found in a separate table."
    ]
   },
   {