Fold: Cytochrome b5

small, heme-binding fold

Lineage:

1. Root: scop
2. Class: Alpha and beta proteins (a+b)
   Mainly antiparallel beta sheets (segregated alpha and beta regions)
3. Fold: Cytochrome b5
   small, heme-binding fold

Superfamilies:

1. Cytochrome b5 (1)
   1. Cytochrome b5 (6)
      1. Cytochrome b5
         1. Cow (Bos taurus) (6)
         2. Rat (Rattus norvegicus) (12)
         3. Rabbit (Oryctolagus cuniculus) (1)
      2. Cytochrome b558
         a prokaryotic homologue of cytochrome b5
         1. Ectothiorhodospira vacuolata (1)
      3. Flavocytochrome b2, N-terminal domain
         C-terminal domain is beta/alpha barrel
         1. Baker's yeast (Saccharomyces cerevisiae) (4)
      4. Sulfite oxidase, N-terminal domain
         1. Chicken (Gallus gallus) (1)