A silver halide color photosensitive material comprises a blue-sensitive layer, a green-sensitive layer, a red-sensitive layer and a non-light-sensitive layer on a support. The bellows unit is extendable for either elevating the second mattress or providing a support for an individual. The rolling bearing 3 includes a circumferential groove formed on an outer periphery of an outer ring 5 and an axial groove extending from place in the circumferential groove and opening on a lateral side of the outer ring 5. Thus, one can move the post out of the way when the compartment does not contain a storage disc, thus freeing up the compartment to better store other items. Apomictic seeds resulting therefrom, plants and progeny obtained through germination of such seeds, and genes encoding proteins acting in the signal transduction cascade triggered by SERK constitute further subject matters of the invention.