Whether or not a sample of skin or of a skin equivalent contains such amount of a papillary fibroblast population as to be considered a normal skin is determined by labelling said skin or skin equivalent with at least one antibody specific for papillary fibroblasts and evaluating the extent of such labelling as a marker for skin or skin equivalent quality. Methods for producing granules are diversely used in chemical process engineering, for example, for producing starting materials for shaped bodies and, to be precise, for brake linings and sealing elements. When the mounting member is attached to the body, the first rib abuts against the other of the shaft portion and the shaft receiving portion.