IMs are located between alveolar epithelial cells, and unlike AMs, are negative for CD169 (Siglec-1 or sialoadhesin), a cell adhesion molecule shown to discriminate phenotype between AMs (CD206+CD169+) and IMs (CD206+CD169).15 16 AMs can be further subdivided by levels of expression of the high affinity-scavenger receptor CD163 (CD163++ or CD163+++ subpopulations).16 Within the lung there is also a population of immature, infiltrating CD14+ pulmonary monocyte-derived cells, thought to be recently recruited into the extravascular space
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It also puts you at greater risk of tooth decay, poor healing post-surgery and oral cancer (approximately 90% of people with cancer of the mouth, tongue, lips, and throat use or have used tobacco)