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Transfers were made to twenty-two ewes of pairs of sheep eggs which had been fused in vitro after mechanical removal of the zona pellucida. The zona pellucida of the sheep egg unlike that of the mouse egg could not be removed by pronase digestion. Single lambs were born to three ewes. Transferrin typing was used to identify the genotypes of the lambs. The transferrin findings on one (still-born) lamb were in accord with expectations for a chimaeric lamb.doi:10.1530/jrf.0.0170543 pmid:5752107 fatcat:zk6jj45nuvgsjeg4wwuadz5wmm