In the field of genetics-- and specifically for copy number variation (i.e., big chunks of genome deleted or inserted)-- the red/green contrast was deemed inaccessible to color-blind individuals, and so a new red/blue scheme was implemented as a consensus scheme.
red - deletion of genetic sequence
blue - insertion of genetic sequence
red - deletion of genetic sequence blue - insertion of genetic sequence
1: https://www.iscaconsortium.org/index.php/the-news/95-the-mea...