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