a monoclonal antibody ( clone s-30 ) , directed to a protein of 57,000 daltons , was developed from the fusion of mouse myeloma cells and the spleen cells of mice injected with cytoskeletal extracts of fibroblasts that have been aged in in vitro culturing conditions according to a schedule of serial passaging ( cristofalo vj , charpentier r : j tissue culture meth 6:117 , 1981 ;
C0007634
the
C0016030
fibroblasts