Elongated peroxisomes in duodenal epithelial cells. Varying between persons, rounded or elongated peroxisomes are observed. They also vary between epithelial cells on the villus and in the crypt. See: http://gut.bmj.com/content/32/8/858.long Bar = 1µm.
Peroxisomes are contrasted with DAB at pH 10.5 by their catalase activity, after fixation in buffered formal-calcium; postfixed in OsO4. 0.8 µm thick section