| http://www.w3.org/ns/prov#value | - If the thiol groups of the starting material have been blocked, unblocking is effected by the known methods, for example by reaction with a reducing agent capable of freeing the previously blocked thiol group, such as 2-mercaptoethanol, giving the new prolonged-action glycoprotein which inactivates ribosomes, ready to be used for coupling with an antibody to give an immunotoxin.
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