in ejaculated or cauda spermatozoa , incubation in the capacitating medium caused the appearance of fluorescence in the flagellum and either a loss of fluorescence on the pm overlying the sperm head ( pm proteins of 5.0 and mr 80,000 ) or a delocalization of fluorescence on the head pm ( pm proteins 2.0 and 4.85 ) .
C0037868
spermatozoa
C0037844
sperm head