Fig. 3 Whole mount miRNA in situ hybridization on adult tissues.
(A–D) MiR-23 is expressed in the bulbus arteriosus (b) of zebrafish adult hearts fixed in PFA (A,C) and PFA+EDC (B–D). PFA+EDC fixed hearts revealed a more detailed miR-23 expression pattern with a ring-like expression (arrowhead in B) at the inflow area of the atrium (a) and in coronary arteries (arrowheads in D) overlying the ventricle (v). (E,F) Robust miR-23 expression was detected in joint structures of PFA+EDC fixed caudal fins (arrowheads in F) versus more diffuse miR-23 expression in caudal fins fixed in PFA only (E). (G) Negative control heart was fixed in PFA+EDC but not incubated with a probe. Scale bars represent 100 μm.