The pigment observed in a fixed tissue sample is most likely derived from which fixative?

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Multiple Choice

The pigment observed in a fixed tissue sample is most likely derived from which fixative?

Explanation:
When pigments appear in fixed tissue, some are artifacts from the fixative itself rather than anything produced by the tissue. A well-known artifact is formalin pigment, which forms when tissue is fixed in formalin and shows up as brown to black granules. This pigment is derived from the fixative, not from the tissue’s own components. The other pigments listed—melanin, lipofuscin, and hemosiderin—are endogenous pigments produced by the tissue under normal or pathologic processes, not by the fixative. So the observed pigment is best explained by the use of formalin as the fixative.

When pigments appear in fixed tissue, some are artifacts from the fixative itself rather than anything produced by the tissue. A well-known artifact is formalin pigment, which forms when tissue is fixed in formalin and shows up as brown to black granules. This pigment is derived from the fixative, not from the tissue’s own components. The other pigments listed—melanin, lipofuscin, and hemosiderin—are endogenous pigments produced by the tissue under normal or pathologic processes, not by the fixative. So the observed pigment is best explained by the use of formalin as the fixative.

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