Sirius Red F 3B (Direct Red 80) is an azo dye primarily used in staining methods for collagen and amyloid.

[1] It has the molecular formula C45H26N10Na6O21S6.

In histology, sirius red staining is used in various domains of diagnostic to observe fibrosis levels in a lot of cases of inflammation induced by cancer, vascular or metabolic pathologies.

[2] In bright field microscopy the following can be observed: This article about an organic compound is a stub.

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