= Luteinising hormone
{title2=$\mathrm{LH}$}
<Luteinising hormone> is a gonadotropin released by the anterior pituitary under hypothalamic control. It acts on the <gonads>: in <testes> it stimulates steroid production by Leydig <cells>, while in an ovarian cycle its surge helps trigger <ovulation> and the transition to a <corpus luteum>.<Biology 2e by Mary Ann Clark and others>[Section 43.4, hormonal control of the reproductive systems]{ref}
The signal is dynamic. A sustained low <concentration> and a brief surge need not have the same physiological meaning, and a sparse sampling schedule can miss a peak. The same <hormone> also acts in different cellular contexts, illustrating that a <hormone>'s identity alone does not determine one universal response. <Receptor> expression, developmental state and the other gonadal signals contribute to the outcome.
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