gonad | embryonic stage (with wb37.01)
gonadal sheath proper primordium | embryonic stage (with wb37.01)
visceral trunk mesoderm | embryonic stage (with wb37.01)
wb37.01/wb146.21 embryos have gonads with at least one somatic gonadal precursor (SGP) cluster that does not fuse with other SGPs. Somatic gonadal precursor specification appears normal.