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. Author manuscript; available in PMC: 2006 Jan 26.
Published in final edited form as: J Androl. 2005;26(3):369–378. doi: 10.2164/jandrol.04178

Figure 3.

Figure 3

The effects of l-arginine and luteinizing hormone (LH) on testosterone production by rat Leydig cells. Purified rat Leydig cells were prepared as described in “Materials and Methods” and were incubated in l-arginine–free Leydig cell medium (LCMA), LCMA with added l-arginine (5 mM, LCMA + Arg), LCMA in the presence of LH (0.5 ng/mL, LCMA + LH), and LCMA in the presence of LH and l-arginine (LCMA + LH + Arg). Each bar represents the mean ± SEM for testosterone production and is the outcome of 3 separate determinations repeated with similar results.