Growth factor gene IGF1 is associated with bill size in the black-bellied seedcracker Pyrenestes ostrinus.
Nature Communications
vonHoldt, Bridgett M BM; Kartzinel, Rebecca Y RY; Huber, Christian D CD; Le Underwood, Vinh V; Zhen, Ying Y; Ruegg, Kristen K; Lohmueller, Kirk E KE; Smith, Thomas B TB