Marcotrigiano (image) Botanical Society of America Share Print E-Mail Caption The extent of cell division in the leaf epidermis alters the extent of cell division in the mesophyll and is a factor regulating blade expansion and ultimate leaf size. Credit Courtesy of Michael Marcotrigiano, Smith College, Northampton, MA. Usage Restrictions Please cite credit line and source of publication for use 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.