1989 Photomicrography Competition

Gamma-Aminobutyric acid (central nervous system inhibitory neurotransmitter) crystal

Dr. Dennis D. Kunkel

Affiliation
University of Washington
Department of Neurological Surgery
Seattle, Washington, USA
Technique
Brightfield/polarized illumination
Magnification
40x

Dog flea (Ctenocephalides canis)

David Martella

Location
Princeton, New Jersey, USA
Technique
Rheinberg Illumination