Normal Fly (image) Université de Genève Share Print E-Mail Caption The hairs on the back of a fly are sensory organs consisting of four cells produced by two asymetrical divisions. Credit © UNIGE / Marcos Gonzalez-Gaitan Usage Restrictions the image may only be used with appropriate caption or credit. 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.