Relationship between Classical Mutation Nonagouti and Japanese Fancy Mouse (image) Research Organization of Information and Systems Share Print E-Mail Caption The nested retrotransposition of the β4 sequence into VL30 at the agouti gene is a true cause of nonagouti and the mutation is probably arose in JF1. Credit Tsuyushi Koide, the National Institute of Genetics (NIG) in Japan Usage Restrictions Credit required. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.