2630591 SRTX S6c sarafotoxin S6c 3 2264994 SXS6c sarafotoxin S6c 3 3721500 StxS6c sarafotoxin S6c 3 2921537 SFTX6c sarafotoxin S6c 2 3721501 STX-S6c sarafotoxin S6c 2 3479332 SS6c sarafotoxin S6c 1 2202077 STX6c sarafotoxin S6c 1