Relationship between plastron length and (A) the amount of antibodies that can bind to lipopolysaccharide (LPS), (B) avidity, (C) total immunoglobulin, (D) number of spots per 105 cells cultured in media only, (E) number of spots per 105 cells cultured in the presence of LPS and (F) white blood cell count (WBC). Relationship between plastron length and (A) the amount of antibodies that can bind to lipopolysaccharide (LPS), (B) avidity, (C) total immunoglobulin, (D) number of spots per 105 cells cultured in media only, (E) number of spots per 105 cells cultured in the presence of LPS and (F) white blood cell count (WBC). Laura M. Zimmerman et al. J Exp Biol 2013;216:633-640 © 2013.