Zyagen offer frozen horizontal sections containing most rat brain major regions from olfactory bulb to cerebellum. Brains are snapped frozen in OCT, sectioned in horizontal orientation at a thickness of 7-10 microns, and sections mounted on positively charged slides. Each slide contains 2 sections. Frozen sections are shipped in tightly closed slide boxes or slide mailers on dry ice. Brain frozen horizontal sections of rats perifused with 10% neutral buffered formalin or 4% paraformeldehyde are also available upon request. Sections are made under RNase- and protease-free conditions and are ideal for immunohistochemistry and in situ hybridization.