Fig. 6. Expression of zebrafish prim1, p53 and chk2 genes. (A-D) Expression of prim1. Lateral views of embryos (A-C) and sectioned retina (D). The expression of the prim1 gene is observed in the entire head at 24 hpf (A) and is prominent in the eyes and tectum at 33 hpf (B). At 48 hpf, piy expression is observed mainly in the proliferative zones of the eye and tectum (C-D). (E-H) The expression pattern of p53 is similar to that of prim1. (I-L) The expression pattern of the zebrafish chk2 gene is similar to that of prim1.