What are OMIM Symbols

• An asterisk (*) before an entry number indicates a gene. • A number symbol (#) before an entry number indicates that it is a descriptive entry, usually of a phenotype, and does not represent a unique locus. • A plus sign (+) before an entry number indicates that the entry contains the description of a gene of known sequence and a phenotype. • A percent sign (%) before an entry number indicates that the entry describes a confirmed Mendelian phenotype or phenotypic locus for which the underlying molecular basis is not known. • No symbol before an entry number generally indicates a description of a phenotype for which the Mendelian basis, although suspected, has not been clearly established or that the separateness of this phenotype from that in another entry is unclear. • A caret (^) before an entry number means the entry no longer exists because it was removed from the database or moved to another entry as indicated.