Abstract: A vehicle side rail system is for use with a vehicle, such as a truck, having an elevated chassis and having a longitudinally extending frame member. The side rail system includes a pair of support members mounted to the frame member and extending transverse to the frame member. The support members have a plurality of openings extending therethrough. The system includes a pair of legs, each leg having a mounting portion and a depending rail portion. The mounting portions have a plurality of openings therethrough and the mounting portions are telescopically mounted to a respective support member and selectively mountable thereto. Each rail portion has a plurality of openings. Fasteners are insertable into aligned openings of respective mounting portions and support members to secure the legs to the support members at a desired location. At least one rail extends between and mounted to the rail portions. The rail is selectively mountable to the rail portions.

Abstract: The invention provides methods for determining the concentration of polypeptides. The methods generally comprise labeling a polypeptide with a metal label such as colloidal gold and quantifiably detecting the polypeptide-metal complex; the methods are improvements over other quantification assays that use colloidal gold. The invention further provides kits for practicing the methods.