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XB-ART-23460
J Exp Zool 1992 Aug 15;2632:210-4. doi: 10.1002/jez.1402630211.
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Xenopus laevis sperm proteins, previously identified as surface proteins with egg coat binding capability, are indeed histone H4, histone H3, and sperm specific protein SP2.

Bernardini G , Donne ID , Norreri S , Negri A , Milzani A .


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Recently, four Xenopus sperm proteins thought to be involved in binding to the egg envelope were identified (Lindsay and Hedrick, J. Exp. Zool., 245:286-293, '88). We have studied the three more abundant ones of apparent molecular weight of 14, 19, and 25 kd in SDS-PAGE. We have shown that these proteins are indeed nuclear basic proteins: the 14 kd is the histone H4, the 19 kd is the histone H3, and the 25 kd is the sperm-specific protein SP2.

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Species referenced: Xenopus laevis
Genes referenced: h4c4 sp2