| 1.13.01. | Protein disulfide isomerase (1 family) PF00085 (Pfam) | |
| 1.13.02. | D-glucuronyl C5-epimerase (1 family) PF06662 (Pfam) | |
| 1.13.03. | Peptidyl-prolyl cis-trans isomerase, FKBP-type (1 family) PF00254 (Pfam) | |
| 1.13.04. | Prostaglandin E synthase (1 family) PF00043 (Pfam) |