IMMUNIT'l'. 



89 



nated haptophores and to.xophores. The haptophore of the 

 toxin has an affinity for the cell receptors. The union of the 

 toxin haptophore and the cell receptor forms a medium through 

 which the tuxin toxophore passes to the central part of the 

 cell where it exerts its action. 



Fit' t;C> — ToxU' liiinmnit.v. .\ ci 11 

 themic receptors, and toxin molecul 

 Legend — 



a. Cell body. 



b. Cell receptors. 



c Free cell receptors. 



Haptophore of toxin niol. cule. 

 Toxophor.' or toxin molecule. 

 Toxin molecule. 

 Toxin molecul.- combining with ti 



d. 



active central 

 urrounding It. 



cell-receptor. 



margiiiiil 



Toxin molecule floating fr. 

 cell-receptor. 



e and about to combine with a free 



The toxin haptophores are not injurious except as they enable 

 the destructive toxin toxophore to reach the central cell mass. 

 Toxin toxophores in the absence of toxin haptophores are mac- 



