Abstract
A specific cytotoxic agent against gastric cancer was constructed by covalently coupling the ricin A chain to monoclonal artibody, MGb2, MGb2 was modified by SPDP to introduce the 3-(2-pyridylthio) propionyl radical and then treated with a reduced A chain to give a disulfide linked conjugate, that retained the original binding specificity of the antibody moiety. The conjugate obtained retained the activity of the antibody and the biological activity of the A chain well.
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