Lead flashing was commonly used on chimneys, around other roof penetrations such as vent pipes, and roof junctions, such as valleys. It is still used for this, but is less common because of its cost, and the availability of alternatives. Modern alternatives: pvc, butyl rubber etc. are often less durable.
Granulocytes, specifically neutrophils, help the body fight bacterial infections. The number of granulocytes in the body usually increases when there is a serious infection. People with a lower number of granulocytes are more likely to develop bad infections more often.
Neutrophils belong to the class polymorphonuclear granulocytes, and have a multilobed nucleus. These phagocytic cells provide the first line of defense against foreign bodies and pathogens, and play a major role in activating an immune response against a pathogenic agent.