Expression patterns of candidate genes from the Schmidtea mediterranea traces database. Expression in whole mount in situ hybridization of different genes in (1) control and (2) 75 Gy irradiated planarians 6 days after irradiation. A, chaperonin containing TCP1 theta subunit homolog; B, splicing factor 3b subunit 1 homolog; C, TNF receptor-associated factor homolog; D, similar to pol polyprotein; E, unknown protein; F, lectin-like homolog. F.3 shows a higher magnification view of a transverse section from F.2 (dashed line), where the two posterior gut branches were labeled. Scale bars: 250 μm in panels A.1 to F.2 and 100 μm in panel F.3.