Renal hyalin

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Abstract
This describes the sodium sulphate-Alcian Blue (SAB) method for staining amyloid in paraffin sections. Its value lies in the possibility of subsequent counterstaining and thus of revealing the structural relationships of amyloid. In the kidney the topical disposition of amyloid closely resembles the disposition of fibrin in the kidney of diabetics; this suggests that upset in vascular permeability plays a part in determining the site of the amyloid deposits. Furthermore, an aging process in amyloid can now be envisaged resembling the aging of extraluminal fibrin. Both materials proceed to a hyalin material that, staining like collagen, merits the name pseudo-collagen. This term we apply to a hyalin, staining like collagen, for which, we can postulate a specific precursor.

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