Figure 2: Comparison of Empathy-Driven Observational Fear in Different Mice Strains (image) Institute for Basic Science Share Print E-Mail Caption 129S1 mouse strain shows significantly higher empathic fear than other strains. Genome analyses pointed to a single variant of the Nrxn3 gene which affects some specific neurons in the brain cortex of these mice. Credit IBS Usage Restrictions None 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.