MSX Spores (IMAGE) Virginia Institute of Marine Science Caption This is a histological image of <I>Haplosporidium nelsoni</I> (MSX). The pink refractory bodies are MSX spores in oyster tissues. Credit Image courtesy Eugene Burreson/VIMS. Usage Restrictions One-time use only. 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.