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Immunohistochemistry of ANPEP(CD-13). Junctional zone displaying difference in localization of ANPEP in (panels a to c) E17.25 vs (panels d to f) E20. DC denotes decidual cells, GC giant trophoblast cells (white arrow), ST spongiotrophoblast layer. Labyrinth zone at E17.25 (panel g) and E20 (panel h) displaying no difference in ANPEP localization. Black arrows indicate blood vessles within the labyrinth zone. Panel i is a negative isotype (IgG) of labyrinth zone
