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Effects of the dose of heparin on the a, b: Values with diffe rent superscript letters were significantly different at the 5% level within c, d: Values with different superscript letters were significantly different at the 1% level within number of metaphase plates and on the sexing rates. for 2 h. SD). same stage. same stage. 713-717. 1972. 19) LARSON, R. C., G. G. IGNOTZ and W. B. CURRIE, Development of in vitro fertilized bovine embryos beyond the 8-cell block using completely defined medium containing fibronectin.