IVF blastomere In IVF, a blastomere is a single cell in an early-stage embryo. During the first few days after fertilization, the zygote undergoes a process called cleavage, in which it divides into multiple cells called blastomeres. A typical human embryo will have 2-4 blastomeres on day 2, and 6-8 blastomeres on day 3. Blastomere […]