Modeling Human Erythrocyte Shape and Size Abnormalities
  We present simple parametric equations in terms of Jacobi elliptic functions that provide a realistic model of the shape of human normal erythrocytes as well as of variations in size (anisocytosis) and shape (poikilocytosis) thereof. We illustrate our results with parameterizations of microcytes, macrocytes and stomatocytes, and show the applicability of these parameterizations to the numerical calculation of the induced transmembrane voltage in microcytes, macrocytes and stomatocytes exposed to an external RF field of 1800 MHz. 
S. Munoz, J.L. Sebastian, M. Sancho and G. Alvarez