Class: Small proteins

Usually dominated by metal ligand, heme, and/or disulfide bridges

Lineage:

1. Root: scop
2. Class: Small proteins [56992]
   Usually dominated by metal ligand, heme, and/or disulfide bridges

Folds:

1. Cystine-knot cytokines [57500] (1)
   1. Cystine-knot cytokines [57501] (1)
      1. Neurotrophin [57520] (2)
         1. Brain-derived neurotrophic factor/neurotrophin 3 heterodimer, BDNF/NT3 [57521]
            1. Human (Homo sapiens) [57522] (4)
         2. Neurotrophin 4 [57523]
            1. Human (Homo sapiens) [57524] (1)