(A) Whole mount in situ hybridization detecting CIP transcript expression in E9.5 mouse embryos. In situ hybridization detecting CIP transcript expression on sections of staged mouse embryos (B-G) and in an adult mouse heart (H). (B, E, F, G) transverse sections; (C, D, H) sagittal sections. h: heart; a: atrium; la: left atrium; lv: left ventricle; ra: right atrium; rv: right ventricle; v: ventricle.