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![Studies of postpartum mammary gland involution reveal novel pro-metastatic mechanisms](https://image.oaes.cc/008417c5-9703-4f06-99d8-965abf6967a3/2971.fig.1.jpg)
Figure 1. BVD and LVD during mammary gland development. BVD measured as number of blood vessels per millimeter and LVD measured as number of lyve-1 positive vessels per millimeter in nulliparous (N), pregnant (P), lactating (L), involuting (days 2-10) and regressed (R), mammary glands (data adapted from Lyons et al.[16] and Ramirez et al.[144]). BVD: Blood vessel density; LVD: lymphatic vessel density