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Saith, R.R.; Bersinger, N.A.; Barlow, D.H.; Sargent, I.L. (1996). The role of pregnancy-specific β-1 glycoprotein (SP1) in assessing human blastocyst quality in vitro. Human reproduction, 11(5), pp. 1038-1042. Oxford University Press 10.1093/oxfordjournals.humrep.a019293
