The genetic basis of a plant–insect coevolutionary key innovation Wheat et al. 2007 PNAS December 18,2007, vol.104,no.51, p.20427-20431 10.1073/pnas.0706229104シロチョウ科のチョウの幼虫が持つglucosinolate解毒酵素遺伝子が進化した時期を特定…