| cblC | Methylmalonic acidemia combined with homocystinuria |
| BEM | Bull’s Eye Maculopathy |
| NBS | Newborn Screening |
| DBS | Dried Blood Spot |
| OCT | Optical Coherence Tomography |
| ERG | Electroretinography |
| C3 | Propionylcarnitine |
| MMA | Methylmalonic acid |
| Hcy | Homocysteine |
| Met | Methionine |
| OHCbl | Hydroxocobalamin |
| OPL | Outer Plexiform Layer |
| ONL | Outer Nuclear Layer |
| FF | Fix and Follow |
| CSM | Central, Steady, Maintained |
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