Third, researchers have focused on so-called gene-environment interactions, reasoning that some exposures that have relatively weak associations with breast cancer in the general population may have a much stronger effect in subgroups with a specific genetic make-up.
"If you understand the distribution of these structures in the skin of a prey animal, you can understand something about predator-prey interactions, and it might explain some of the hadrosaur fossils we see with these bite marks, " he said.