3.4.24.12 culture medium - 36997 3.4.24.12 egg unfertilized and fertilized 36985 3.4.24.12 embryo - 36978, 668835 3.4.24.12 embryo blastula 36999 3.4.24.12 embryo blastula secrete 36977, 37000 3.4.24.12 embryo secreted by the hatched blastula 36997 3.4.24.12 embryo secretion by the blastula stage embryos during the 2-h period prior to hatching. The biosynthesis of the enzyme begins at the late morula/early blastula stage up to 6 h before secretion 36996 3.4.24.12 hatching liquid - 36974, 36983, 36991, 36993