Recombinant Shiga Like Toxin-1 Subunit B from E.Coli O157:H7 produced in E.coli containing amino acids 2-90 of the Shiga Like Toxin-1 Subunit B.The Shiga Like Toxin 1 protein is fused to a 6xHis tag at its N-terminus and purified by proprietary chromatographic technique.