Glycoprotein hormones were always composed of subunits--we just had to find out the hard way.
Papkoff
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Hormone Research Institute, San Francisco, California.
D000818:Animals; D049673:History, 20th Century; D006801:Humans; D007986:Luteinizing Hormone / Q000737:chemistry; D046911:Macromolecular Substances; D010908:Pituitary Hormones, Anterior / Q000737:chemistry*
D046911:Macromolecular Substances; D010908:Pituitary Hormones, Anterior; D007986:Luteinizing Hormone