Disclosed are human VEGF2 polypeptides, biologically active, diagnostically or therapeutically useful fragments, analogs, or derivatives thereof, and DNA encoding such VEGF2 polypeptides. Such compatibility may be determined by the circuitry based at least in part upon at least one feature set of the device. In one version, one leg is a highpass filter while the other leg is a bandstop filter outputting into a lowpass filter.