Figure 1 (IMAGE) Penn State Caption Illustration of chromosome 16 showing the 14 fly counterparts of the 25 human genes located in a deletion on the chromosome that is associated with autism risk. Researchers used RNA interference (RNAi) to the reduce the expression of these genes individually and in tandem to test how the interactions of these genes modulate neurodevelopmental symptoms associated with the deletion. Interactions between genes that either enhance or suppress the affect of reduced expression are shown by red or blue lines. Credit Girirajan Laboratory, Penn State Usage Restrictions None License Licensed content 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.