9Epping J J, Schroeder A C. Capacity of mouse oocytes from preantral follicle to undergo embryogenesis and development to live young after growth, maturation and fertilization in vitro. Biology of Reproduction, 1989, 41:268-276.
10Wu J, Emery B R, Carrell D T. In vitro growth, maturation, fertilization, and embryonic development of oocytes from porcine preantral follicles. Biology of Reproduction, 2001, 64: 375-381.