. . . . . . "Variable features that are observed for this entity - such as known PTM or methylation sites and non-covalent bonds."^^ . "Variable features that are observed for this entity - such as known PTM or methylation sites and non-covalent bonds."^^ . "Variable features that are observed for this entity - such as known PTM or methylation sites and non-covalent bonds."^^ . . . . . . .