Box and whisker plots showing stimulation indices for green sea turtle (Chelonia mydas) lymphocytes exposed to respective mitogens. ‡=Significantly different from Indian River Lagoon (IRL, Florida) turtles both with (VT+) and without visible tumors (VT–). †=Significantly different from both Trident Basin (TRI, Florida) and IRL VT–. Stimulating agents included phytohemagglutinin (PHA), concanavalin A, lipopolysaccharide (LPS), phorbol 12-myristate 13-acetate (PMA) + ionomycin, or pokeweed mitogen (PWM), with complete media as a negative control.