An increase in alveolar monocyte-like cells in macrophage scavenger receptor (MSR)-dominant negative (DN) MafB transgenic mice.

<p>In BAL cells from MSR-DN MafB transgenic mice, mononuclear cells were frequently observed compared with wild-type (WT) mice (arrow). Their cytoplasmic granularities were less than alveolar macrophages, but they had pseudopods on the cell surface, a typical finding for phagocytes. They were also positive for Mac-3, suggesting that they were monocytic lineage cells, namely alveolar monocyte. Original magnification: ×1000.