Two Aging Paths (IMAGE) University of California - San Diego Caption Yeast cells with the same DNA under the same environment show different structures of mitochondria (green) and nucleolus (red), which may underlie the causes of different aging paths. Single and double arrowheads point to two cells with distinct mitochondrial and nucleolar morphologies. Credit Hao Lab, UC San Diego Usage Restrictions Must be used in conjunction with Science paper on two paths of aging. 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.