a morula called blastomeres in a solid ball contained within the zona pellucida

organ morula early-stage embryo consisting cells called blastomeres solid ball contained zona pellucida rendering morula embryo embryonic blastomeres differentiation division early stage fertilization fetus anatomy biochemistry biology biotechnology blastocyst cell cultivation cultured develop development egg gene genetic health health care human isolated medical medicine microscopic mitosis molecular nucleus organism ovum pellucida protein reproduction science scientific sperm stem therapy 3d