CRAI File

**Semantic type:** Manufactured Object

**Definition:** An external index file created by the sequencing data archive alongside a compressed reference-oriented alignment map (CRAM) file. This index file is available in the same directory as the CRAM file and is required for selective access to the genomic sequence alignment data within the CRAM file.

**Synonyms:** - CRAI - CRAM Index - Compressed Reference-oriented Alignment Map Index