The present invention provides recombinant yellow fever viruses, particularly live attenuated recombinant YFV, which comprise exogenous nucleotide sequences which encode exogenous amino acid sequences. The location of the facial feature points are used to segment the face into different regions such as skin, eyes, eyebrows, nose, mouth, neck and hair regions. This invention also discloses a device to carry out this method. The polyesters of the invention may be formed into a variety of products, especially binder fibers for nonwoven fabrics, textileindustrial yarns and fabrics, composites and other molded articles. Next, the silicon nitride layer may be etched until the silicon oxide layer is exposed.