Fruit Fly Chromosomes Show Condensin II Effect (image) University of Arizona Share Print E-Mail Caption The red balls are each false-color digital images of a nucleus of a fruit fly salivary gland cell. The nuclei are 50 micrometers in diameter, about one-half the width of a human hair. Each ball is composed of about 2,000 chromosome fibers. The yellow-green dots, multiple copies of a specific gene marked by green fluorescent protein (GFP), are all snuggled up together in the top image, the nucleus without condensin II. The bottom image shows how the GFP-marked genes are moved apart after condensin II is produced in the nucleus. Credit Helen F. Smith, The University of Arizona. Usage Restrictions This image may only be used to illustrate a story about the research described in this release. Photo credit must be given as: Helen F. Smith, The University of Arizona. 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.