The Pfam protein families database in 2019. - Sara El-Gebali; Jaina Mistry; Alex Bateman; Sean R. Eddy; Aurelien Luciani; Simon C. Potter; Matloob Qureshi; Lorna J. Richardson; Gustavo A. Salazar; Alfredo Smart; Erik L. L. Sonnhammer; Layla Hirsh; et al. (Nucleic Acids Res., 2019)