Normal Sperm (IMAGE) University of California - Davis Caption These are normal human sperm. Green dots show the presence of a sugary molecule that allows the sperm to swim through cervical mucus. Credit Ted Tollner, UC Davis Usage Restrictions May be used with acknowledgement of the source. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.