The present disclosure relates to a composite assembly comprising an optically transparent substrate. A mobile station performs a make-before-break handoff of a control channel between a serving and target base station and a break-before-make handoff of a traffic channel between the serving and target base stations. The mating magnetic rivets may have contacting surfaces of oval shape with the rivet recessed within an oval-shaped channel to prevent misalignment of frame and shield with a single point of magnetic contact. The cell model established in the present invention is sensitive, highly effective and reliable, and can be used in high-throughput screening andor high-content screening of c-Fms tyrosine kinase inhibitors.