1. Use of the progestin challenge test in nonhuman primates (Macaca fascicularis) 
Robert M. Blair, Ph.D., J.Mark Cline, D.V.M., Ph.D., Mary S. Anthony, Ph.D., Thomas B. Clarkson, D.V.M. 
Fertility and Sterility 
Volume 77, Issue 2, Pages (February 2002)
DOI: /S (01)

2. FIGURE 1
Observed incidence of withdrawal bleeding during the seven days following the cessation of MPA administration. Solid columns (■) represent animals receiving vehicle mg/kg MPA; open columns (□) represent animals receiving vehicle mg/kg MPA; shaded columns (▩) represent animals receiving E mg/kg MPA; stippled columns (▩) represent animals receiving E mg/kg MPA.
Blair. Progestin challenge in nonhuman primates. Fertil Steril 2002.
Fertility and Sterility  , DOI: ( /S (01) )