Figure 6From: A critical period of progesterone withdrawal precedes menstruation in macaquesImmunostaining for MMP-1, MMP-2 and MMP-3 in the pigtailed macaque endometrium. Samples were collected either on day 0 (a,c,d) or on day 2, 48 hours after P withdrawal (b,d,f). Note the strong gradient of MMP immunostaining with the strongest signal in the upper and mid functionalis zone. Magnifications (50× original magnification).Back to article page