CHICKEN EMBRYO VASCULAR SYSTEM
This fluorescence micrograph shows the vascular system of a developing chicken embryo, two days after fertilization.  Injecting fluorescent dextran revealed the entire vasculature used by the embryo to feed itself from the rich yolk inside the egg.  Beautiful.  Via - Fast CoDesign

CHICKEN EMBRYO VASCULAR SYSTEM

This fluorescence micrograph shows the vascular system of a developing chicken embryo, two days after fertilization.  Injecting fluorescent dextran revealed the entire vasculature used by the embryo to feed itself from the rich yolk inside the egg.  Beautiful.  Via - Fast CoDesign