The wild-type reference sequence and the variant sequence are shown in red, flanked by sequences 500 bp upstream and 500 bp downstream of the variant, in the following format:

500 bp upstream sequence
Reference/Variant (in red)
500 bp downstream sequence

All displayed sequences are on the forward (plus) genomic strand of the Ensembl genomic build specified in the "Location" section of the feature page.
Genomic coordinates of variants are curated from publications by ZFIN curators, or submitted directly to ZFIN by collaborators.
For variants that have been mapped to the latest genomic build, ZFIN retrieves the 500 bp upstream and downstream flanking sequences based on the curated/submitted coordinates.