Gene Targeting Via Nipple Injection (IMAGE) The Journal of Visualized Experiments Caption This is an example of gene-targeting in a mouse mammary gland using this technique. Here, a fluorescent gene-targeting substance was injected via the nipple duct, and is shown to have targeted an example gene, cyclophilin. Credit <i>JoVE</i> 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.