blastomeres of mammalian egg, microscopic photo

biology blastomere blastomeres blastula cell cells cleavage cross cut cycle detail development different egg element embryo embryogenesis embryology embryonic equipment fertilization fetal fetus health histology illustration lab light mammalian medical medicine micro microscope microscopic microscopy morula organs ovarian ovulation pattern permanent photo pregnancy preparation reproductive reproductology research science scientific section stage stages structure system zygote