Adaptation and cryptic pseudogenization in penguin Toll-like receptors by Fiddaman, S, Vinkler, M, Spiro, SG, Levy, H, Emerling, CA, Boyd, AC, Dimopoulos, EA, Vianna, JA, Cole, TL, Pan, J, Fang, M, Zhang, G, Hart, T, Frantz, LAF, Smith, A