Disorders of nucleoproteids metabolism. Disorder of metabolism of haemoglobinogenic pigments

Melanoma
а – granules of melanin

Anthracosis of lymph node
а – black pigment (coal) in tissue of

Brown induration of lungs
а – syderobalsts & syderophages; б – thickened

Brown induration of lungs (staining by Pearls)
а – thickened interalveolar septi;