prototoxin

prototoxin

An obsolete term for a postulated toxin of bacterial origin that is particularly lethal and has a high affinity for a corresponding antitoxin.
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(2002), this molecular weight corresponds to the epsilon prototoxin, produced by C.
The activation of the prototoxin seems to produce several isoforms with a range of specific activities between that of the prototoxin and the mature toxin (Worthington and Mulders, 1977).