protein family Article 4 protein function 4 unclassified drug 4 Humans 3 article 3 nonhuman 3 protein localization 3 Computational Biology 2 Phylogeny 2 Protein Conformation 2 biology 2 human 2 metabolism 2 phylogeny 2 protein conformation 2 protein database 2 protein expression 2 protein folding 2 protein secretion 2 protein structure 2 taxon 2 Algorithms 1 Alignment 1 Amino Acid Motifs 1 Amino Acid Sequence 1 Animals 1 Antiporters 1 BPIFA1 1 BPIFB1 1