Originally used for Lyophilizing and storing frozen slices of tissue for quantitative histo- chemistry. Can also be used as a vacuum tube with aluminum holders by Nelson & Wakefield, Journal of Neuropathology & Exper. Neurology, Vol. XXVII, No. 2, April 1968. Joint is 40/50. Use with 5/18-inch I.D. tubing, size G.
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