Piotr Rotkiewicz
Droplet Microscopy
San Diego, California, USA
Polycystine radiolaria fossil skeleton (250x)
Dr. Greg Rouse
Scripps Institution of Oceanography
La Jolla, California, USA
Hypomyzostoma on a crinoid echinoderm (50x)
Ales Ryska
Department of Pathology
Charles University Faculty Hospital
Hradec Kralove, Czech Republic
Intestinal mucosa (200x)