Table 1.

Statistics of the 3 data sets before and after length filtering.

Parameter	Brain	Pineal gland (light treatment)	Pineal gland (dark treatment)
Total number of sequences	14,781,569	5,933,638	10,385,264
Total number of distinct sequences	259,897	265,007	463,789
Total number of sequences after length filtering	14,347,869	5,724,361	10,008,434
Total number of distinct sequences after length filtering	200,520	204,696	351,638