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Light micrograph of a section through the wall of the large intestine (colon), showing smooth muscle fibres (pink) orientated perpendicular to each other at left and right. Between the two, in the collagen (yellow), there are accumulations of purple colour, the Auerbach's plexus (or myenteric plexus); the cells more clearly violet with a round nucleus and nucleolus are the ganglion nerve cells (neurons). HES stain. Magnification: x550 when printed at 10 centimetres wide.
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