id	keyword
animalrev-17	deficiency
animalrev-17	rats
animalrev-17	zinc
animalrev-17	vol
animalrev-17	sperm
animalrev-17	male
animalrev-17	zn deficiency
animalrev-17	spermatogenesis
animalrev-17	cells
animalrev-17	testicular
animalrev-17	testes
animalrev-17	journal