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Background The sperm penetration assay (SPA) is used to predict the fertilizing capacity of sperm. Thus, some programs rely on SPA scores to formulate insemination plans in conjunction with in-vitro fertilization (IVF) cycles. The purpose of this study was to evaluate if a relationship exists between SPA scores and polyspermy rates during conventional IVF cycles. Methods A total of 1350 consecutive...
Transforming growth factor (TGF)-β is secreted as an inactive complex, which frequently contains a large molecular weight binding protein designated latent TGF-β-binding protein (LTBP). Recently, the LTBPs have been shown to be a gene family that contains three known members and exhibits a multidomain structure containing cysteine-rich motifs that are also found in the fibrillin gene family. The...
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