Short-answer question. A defective receptor may cause pygmies to be short.
Benditt
J
J
D001827:Body Height; D002352:Carrier Proteins / Q000097:blood / Q000172:deficiency*; D004392:Dwarfism / Q000209:etiology; D013006:Growth Hormone / Q000502:physiology; D006801:Humans; D011986:Receptors, Somatotropin / Q000502:physiology
D002352:Carrier Proteins; D011986:Receptors, Somatotropin; D013006:Growth Hormone; C051815:somatotropin-binding protein