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Tag7 (PGRP-S) was described as an innate immunity protein. Earlier we have shown that Tag7 forms with Hsp70 a stable complex with cytotoxic and antitumor activity. The same complex is formed in and secreted by cytotoxic T-lymphocytes. We have also found that Hsp-binding protein HspBP1 incapacitates the Tag7–Hsp70 complex. Here we have studied the interaction of extracellular Tag7 and HspBP1. We have...