datasets.md

 # Datasets
 
-## Level, coordinates and datasets
+## Levels, coordinates and datasets
 
-The CC is devided in five levels of increasing complexity:
+The CC is devided in five **levels** of increasing complexity:
 
 |Level|Name|Description|
 |---|---|---|
@@ -12,7 +12,7 @@ The CC is devided in five levels of increasing complexity:
 |`D`|Cells|Readouts of compound cell-based assays.|
 |`C`|Clinics|Clinical data of drugs and environmental chemicals.|
 
-In turn, each level is divided in 5 sublevels representing different aspects of the data. Each sublevel has an *exemplar* dataset, as described below:
+In turn, each level is divided in 5 sublevels or **coordinates** representing different aspects of the data. Each sublevel has an *exemplar* dataset, as described below:
 
 |Coordinate|Name|Description|
 |---|---|---|
@@ -41,3 +41,7 @@ In turn, each level is divided in 5 sublevels representing different aspects of
 |`E3`|Side effects|Side effects extracted from drug package inserts via text-mining techniques.|
 |`E4`|Disease phenotypes|Manually curated relationships between chemicals and diseases. Chemicals include drug molecules and environmental substances, among others.|
 |`E5`|Drug-drug interactions|Changes in the effect of a drug when it is taken together with a second drug. Drug-drug interactions may alter pharmacokinetics and/or cause side effects.|
+
+Each of the coordinates can contain an arbitrary number of **datasets**. All datasets are fully described in the [PostGreSQL database](database), and searchable at `http://chemicalchecker.org/datasets/`. They receive a numbered coding (e.g. `A1.001`).
+
+## Dataset structure of the