A microchip was used for separation of derivatives of histidine (1- and 3-methylhistidine) in clinical applications. A method for determination of degradation products of a chemical warfare agent (nitrogen mustard) was developed. The determination of inorganic cations and anions, including lithium, in clinical samples was shown using commercial PMMA microchips. This separation is shown in Fig. 5 as an example of theapplication of C4D on planar electrophoresis devices. A list of applications of