id	keyword
ct-9941	sperm
ct-9941	mitochondrial
ct-9941	motility
ct-9941	stallion
ct-9941	function
ct-9941	production
ct-9941	oxygen
ct-9941	atp
ct-9941	membrane
ct-9941	cell
ct-9941	species
ct-9941	ca2
ct-9941	ros