Zebrafish mpoand pu.1 expression.

Double in situ hybridization using RNA probes against mpo(red) and pu.1 (purple) at 22 hpf (A) and 24 hpf (B-C). Higher magnification images of the anterior head region (B) and the posterior tail region (C). mpo Expression alone (black arrow) and pu.1 expression alone (white arrow) in A and B. Coexpression of mpo and pu.1 is indicated by black arrowheads (B-C). Lateral views, dorsal upward, anterior to the left.