Caste Determination in Honey Bees (image) University of Illinois at Urbana-Champaign Share Print E-Mail Caption Nurse bees feed larvae destined to be workers not only royal jelly, which queen-destined larvae are fed, but also beebread, or processed pollen (seen here). Beebread contains p-coumaric acid, which alters gene expression and contributes to the honey bees' developmental fate. Credit Terry Harrison, U. of I. beekeeper Usage Restrictions May be used only to accompany stories about the research described in this release. Credit required: Terry Harrison, U. of I. beekeeper 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.