  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.
