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.
Some of the white horses have round spots on them. These horses are called granulocytes, and they are leukocytes of the innate immune system that have granules in their cytoplasm. One type of granulocyte is called a neutrophil. These are granulocytes involved in fighting off pathogens, such as bacteria and fungi. These neutrophils may use something called phagocytosis, which is the process of engulfing a pathogen in order to neutralize or destroy the pathogen.