SPINK2, a robust acrosin inhibitor, is vital for normal spermiogenesis, preventing premature activation of proacrosin and other proteases to avoid spermiogenesis defects. It likely regulates germ cell apoptosis mediated by serine proteases and displays inhibitory activity against trypsin, indicating involvement in diverse serine protease-dependent processes. SPINK2 Protein, Human (HEK293, Fc) is the recombinant human-derived SPINK2 protein, expressed by HEK293 , with C-hFc labeled tag.