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The boards frequently ask about what hormone mimics which hormone in structure.

The classic question talks about one of three groups of similar hormonal groups:

The Glycoprotein family:
These are FSH, LH, TSH, and hCG. They all have the same alpha subunit and only the beta subunit differ among them.
One case seen was a pregnant woman developing hyperthyroidism because of TSH receptor mutation so that it gets stimulated by hCG!

ACTH and MSH
The classical description of why we get hyperpigmentation in Cushing disease

and the last group is
Prolactin, Growth Hormone, and Human Placental Lactogen
 
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