frontal-cortex:

Henrietta Lacks’ “Immortal” Cells
These HeLa cells were stained with special dyes that highlight specific parts of each cell. The DNA in the nucleus is yellow, the actin filaments are light blue and the mitochondria — the cell’s power generators — are pink. (source : Smithsonian.com)

Photo credit : Dr. Omar Quintero
Penn State
Hershey
College of Medicine