Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Drake sperm morphology in eosin-nigrosin smears. (a) Viable sperm with normal morphology, (b) dead sperm, (c) bent-neck sperm, (d) bulb-head sperm, (e) double-head sperm, (f) spermatid-like sperm, (g) protoplasmic drop-like head sperm and (h) looped-head sperm.
