chemical modifications of the tryptophan , methionine , tyrosine and arginine residues of human follicle-stimulating hormone , luteinizing hormone , and the 'functional ' human follicle-stimulating hormone alpha and beta subunits have indicated that the tryptophan in human follicle-stimulating hormone-beta and human luteinizing hormone-beta is essential for the biological activity .
C0023607
luteinizing hormone
C0065261
luteinizing