Brock K T, Granholm N H
Anat Embryol (Berl). 1979 Oct;157(2):161-6. doi: 10.1007/BF00305156.
Strain C57BL/6J-Ay/Ay embryos are developmentally retarded in utero at 90 hpc and are resorbed by 132 hpc. The Ay/Ay developmental delay previously observed in vitro has now been confirmed in vivo. Apparently Ay is involved in some aspect of cleavage stage metabolism.