Cryosectioning of undecalcified tissues for immunofluorescence.

The present report describes a procedure for preparing 4--6 micrometers cryostat sections of undecalcified fresh frozen tissue which contain hard tissue, for immunofluorescence. The apparatus used is a cryomicrotome originally designed for cutting sections for whole body autoradiography. To obtain cryostat sections suitable for tissue immunofluorescence the standard procedure was modified with respect to the hardness and edges of the microtome knife, the temperature of the cryostat and the carboxymethyl cellulose concentration of the embedding material.