Illustrations of abundance in circular RNAs. (a) Relationships of circRNA production in testis (A-05 and A31). 2052 genes able to produce ExoCirc-RNA were considered (all validated) (b) Relationships of circRNA production between A31 and the 7 basic samples (Testis_A-05, A-16, A-54, A-65, A-73, A-93 and 240d). 678 genes able to produce ExoCirc-RNA were considered (650 were validated) (c) Relationships of circRNA production between embryonic cortex samples. Only the 100 genes identified as the best producers of exonic circRNAs were used for this histogram. The basic situation (E80, E100, and E115) is represented in the front histogram (in white). The background histogram (in black) corresponds to E60 and the middle histogram (in grey) to E42.