A foamed plastic container in which the cell diameters vary along a gradient so as not to decrease the content protection performance, in a manner quite different from the foamed cells distributed in the conventional foamed containers. The method further includes detecting at least one security feature of the check. Therefore, it can be used for the prevention and treatment of various retinal vascular diseases including diabetic retinopathy. The amino acid residue in the first position is a tyrosine or tyrosine derivative. Using the trimmed and fluorinated photoresist as a mask, the conductive layer is etched to form conductive features useful as gates.