Electrophoresis cassette system with apparatus and method for filling same

An electrophoresis cassette system which when used with a detector can automatically perform an analysis of radio-labelled molecules. The cassette system is easily assembled and may be reused. The cassette includes a new type of side spacer which incorporates nylon monofilament and which includes a buffer zone for increased accuracy. A new clamp and other improvements further enhance the accuracy of the cassette and reduce variations in the electric field at the bottom and sides of the cell to provide increased accuracy. A new cassette filling system is shown for use with the cassette which permits rapid filling of a cassette with gel material while providing a more uniform gel layer than was previously attainable.