id	keyword
ct-9907	tumors
ct-9907	rabbits
ct-9907	uterine
ct-9907	female
ct-9907	rodents
ct-9907	ovariohysterectomy
ct-9907	ferrets
ct-9907	guinea
ct-9907	treatment
ct-9907	hedgehogs
ct-9907	penis
ct-9907	pigs