A mutation named with the blend of insertion and deletion. It refers to a length difference between two ALLELES where it is unknowable if the difference was originally caused by a SEQUENCE INSERTION or by a SEQUENCE DELETION. If the number of nucleotides in the insertion/deletion is not divisible by three, and it occurs in a protein coding region, it is also a FRAMESHIFT MUTATION.

Synonyms: Insertion Deletion Mutation INDEL Mutations Mutations, Insertion-Deletion Insertion-Deletion Mutations Mutation, INDEL Mutation, Insertion-Deletion Mutations, INDEL INDEL Mutation Insertion-Deletion Mutation