Tests of female spring chinook from Dworshak National Fish Hatchery along Idaho's Clearwater River at Ahsahka likewise showed no evidence of the male-linked genetic marker.

CNN: Something's fishy with chinook salmon

Dr Lagae and Dr Freitas have used similar techniques to find marker molecules for breast cancer and genes linked to cystic fibrosis.

ECONOMIST: Labs on a chip

Big effects can translate into big tests: If a specific number variant is linked to sufficiently high possibility of autism, that variant could serve as an identifiable marker for the condition.

FORBES: Autism And Genetics: It's Complicated