The Human Phenotype Ontology in 2021. - Sebastian Köhler 001; Michael A. Gargano; Nicolas Matentzoglu; Leigh Carmody; David Lewis-Smith; Nicole A. Vasilevsky; Daniel Danis; Ganna Balagura; Gareth Baynam; Amy M. Brower; Tiffany J. Callahan; Christopher G. Chute; et al. (Nucleic Acids Res., 2021)