The up-and-down beta-barrel proteins: three of a kind.
Flower
D R
DR
D001360:Avidin / Q000737:chemistry*; D001426:Bacterial Proteins / Q000737:chemistry*; D002352:Carrier Proteins / Q000737:chemistry*; D050556:Fatty Acid-Binding Proteins; D054835:Lipocalin 1; D009363:Neoplasm Proteins; D017434:Protein Structure, Tertiary; D012471:Salivary Proteins and Peptides / Q000737:chemistry*; D019809:Streptavidin
D001426:Bacterial Proteins; D002352:Carrier Proteins; D050556:Fatty Acid-Binding Proteins; D054835:Lipocalin 1; D009363:Neoplasm Proteins; D012471:Salivary Proteins and Peptides; D001360:Avidin; D019809:Streptavidin