the morphology of the terminal arborizations in laminae i-ii of primary afferent fibers was studied in sections stained by the heavy metal ( nickel and cobalt ) intensification of diaminobenzidine ( dab ) after crushing one dorsal root with horseradish peroxidase ( hrp ) crystals , and with the mixed golgi method which duplicated the staining provided by the first method .
C0347988
heavy metal
C0009148
cobalt