If the initial digit is 1, the trait is autosomal dominant; if 2, autosomal recessive; if 3, X-linked. Each trait defined in this dictionary has a MIM number, the number from the 12th edition of MIM. The MIM number is printed in square brackets with or without an asterisk (asterisks indicate that the mode of inheritance is known; a number symbol (#) before an entry number means that the phenotype can be caused by mutation in any of two or more genes) as appropriate. For example, Pelizaeus-Merzbacher disease [MIM #312080] is an X-linked recessive disorder.