| Name | Info | Provider | Link |
|---|---|---|---|
| PYGM gene | free resource | MedlinePlus Health Information | https://medlineplus.gov/genetics/gene/pygm |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=17404776.ui | |
| subscription/membership/fee required | Springer | https://dx.doi.org/10.1007/s00415-006-0447-x |