FIGURE 1.

Villous tree acquirement after delivery. (a) Schematic diagram of placenta villus tree acquiring. Several placental villous trees (blue dashed box) were dissected from placenta tissue (green dashed box). Placental villous tree sprouts from chorion (violet arrow) connected with fetal by the umbilical cord (yellow arrow). (b) Schematic diagram of histological sections. Placental villous trees were dried and then embedded in optimal cutting temperature medium to OCT imaging. Then frozen immediately to conduct histological sections. OCT, optical coherence tomography