Living tissue cultures often appear translucent

[MikeLigalig.com]

read more
Living tissue cultures often appear translucent to the normal brightfield microscope. They carry some models that have the phase contrast microscopy built in for added viewing contrast. They also carry one inverted tissue culture microscope model with fluorescence microscopy capability.

[Lorenzo]

Living tissue, especially neural tissue, is best seen only when alive. It is impossible to see the small nerves, oligodendrocytes, astrocytes, microglial cells of the brain post-mortem.