LHCGR
LHCGR LH/hCG receptor — the molecular target that 1 compounds in the wiki act on.
In one line: The "make testosterone" receptor on the testicles that HCG switches on.
LHCGR is the receptor on testicular cells that responds to the brain's "make testosterone" signal (LH). The drug HCG mimics that signal and presses this receptor directly — which keeps the testicles working (and full-sized) even when someone is on testosterone therapy, which would otherwise shut them down.
That's why HCG is used alongside testosterone to preserve fertility and testicle size: it keeps the local factory running when the brain's own order has been switched off.