Sertoli cell
A Sertoli cell ( a kind of sustentacular cell ) is a "nurse" cell of the testicles that is part of a seminiferous tubule and helps in the process of spermatogenesis , the production of sperm . 
<triplet> Sertoli cell <subj> sustentacular cell <obj> subclass of <triplet> sustentacular cell <subj> cell <obj> subclass of <triplet> seminiferous tubule <subj> testicle <obj> part of <triplet> sperm <subj> cell <obj> subclass of