Cardiac amyloid. Light micrograph of tissue from a heart in a case of amyloidosis. This is a condition where deposits of amyloid (a glycoprotein) in body organs can threaten healthy function. The amyloid accumulates in the tissue, forming dark pink areas. The deposits can arise from several diseases, or from a primary immune system disorder. The treatment will depend upon the underlying cause, but the symptoms for failure of organs like the heart and kidneys will also need treating.