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It DOES make a difference which wins the race: Scientists scan 100 sperm from one man - and find huge DNA differences
the 'race' betweeen human sperm to the eggs might just look like a bunch of wriggling tadpoles - but it makes a big difference which sperm wins. Even sperm cells from the same man have big genetic differences, a study has shown.
A cross section through a synapse. The synaptic button is green, the insulating glial cell is purple, and the receiving muscle fiber is red. The synaptic cleft is the thin space between the synaptic button and and the muscle fiber. Dark blue circles in the synaptic button are mitochondria, and the small green circles are vesicles filled with yellow neurotransmitters.