mouse preimplantation embryos were used to test the effects of three culture parameters on development of 2-cell stage embryos to the late morula stage ( 40 to 43 hours of culture , 65 to 80 hours after fertilization ) : concentration of potassium ( k ) -- 0.6 mm , 1.4 mm , and 6.0 mm ;
C1281743
preimplantation embryos
C0005712
2