tween 0.5 and 40 hours and 10 were killed 1 week after inj ection. Specimens of ascending and sigmoid colon were removed, fixed in neutral formol-saline, embedded in paraffin, and sectioned at 5 ,u. Slides were dipped into NTB (Kodak) liquid emulsion, exposed for 2 to 4 weeks,
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Lipkin et al. (1962) studied this question.
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