( 3 ) amniocytes ( af cells ) cultured from amniotic fluid resemble the multipotential and early-stage trophoblast , retaining pleomorphism , multinucleation , and lacunae formation as well as production of hcg , progesterone , oestrogen , basement membrane glycoprotein , and type iv collagen .
C0004799
basement membrane
C0009333
type iv collagen