| Protein | Nominativ, Singular | nominative case, singular | |
| Protein(e)s | Genitiv, Singular | genitive case, singular | |
| Protein(e) | Dativ, Singular | dative case, singular | |
| Protein | Akkusativ, Singular | accusative case, singular | |
| Proteine | Nominativ, Plural | nominative case, plural | |
| Proteine | Genitiv, Plural | genitive case, plural | |
| Proteinen | Dativ, Plural | dative case, plural | |
| Proteine | Akkusativ, Plural | accusative case, plural |