updates to the readme file\

Author: Philippe Rocca-Serra

Diff for: README.md

@@ -2,18 +2,22 @@
 
 ## Master branch
 
-In the master branch, we keep example ISA datasets, which may be available in different formats (tab, RDF, JSON)
+In the `master` branch, we provide ISA datasets exemplars, available either in `tab delimited` or `JSON` formats, hence the repository organization.
 
-Other ISA datasets are available:
+Many more ISA datasets are available from production repositories such as:
 
-1. from EMBL-EBI Metabolights
+1. [EMBL-EBI Metabolights metabolomics data archive](https://www.ebi.ac.uk/metabolights/): 
 ftp://ftp.ebi.ac.uk/pub/databases/metabolights/studies/public/
 
-1. from NPG Scientific Data: https://github.com/ScientificDataLabs/ISA-tab
+1. [Nature Springer Scientific Data](http://www.nature.com/sdata/):
+https://github.com/ScientificDataLabs/ISA-tab
+
+1. [Stem Cell Commons](https://hsci.stemcellcommons.org/dashboard):
+e.g.: https://hsci.stemcellcommons.org/data_sets/ff1cb512-ad8c-4810-83f1-69e929a4ae81/#/about/
 
 ## Tests branch
 
-The tests branch contains datasets in ISA, and other formats, used for testing in the ISA-API (https://github.com/ISA-tools/isa-api).
+The `tests` branch contains more datasets in ISA `tab` and `json` format as well as ISA datasets converted to other formats (i.e. `Short Read Archive` format (used by INSDC databses ( the US NCBI SRA archive, the EU EMBL-EBI, the Japanese DDBJ and China's CNG), `MAGE-Tab` formats (EMBL-EBI ArrayExpress), `Sample-Tab` format (EMBL-EBI Biosamples), used for testing in the ISA-API (https://github.com/ISA-tools/isa-api). The branch also contains test datasets for the conversion from 3rd party formats to ISA format (e.g. mzml for mass spectrometry data).