Figure 2: Concentrations of LH (mean ± sem) after the last GnRH (G) pulse of the priming infusion (open arrow) and sequential bolus iv injections (arrows) of senktide (S) (50 μg), NKB (N) (100 μg), and GnRH (0.3 μg) (black arrows) given to agonadal juvenile male monkeys when a GnRH-R antagonist, acyline (A) (arrowhead) 30 min after the first GnRH challenge (closed data points)