Figure 2. Change in VEGFR-2 immunoreactivity in the mammary epithelium of virgin, pregnant (P-10 and P-18), lactating (L-0, L-5, L-10, and L-20), and post-weaning (W-5 and W-10) mice. Each datum represents mean ± SE. Change in immunostaining intensity was significant (p < 0.01).