Neutrophils and
monocytes /
macrophages are important source of S100A12 in the cell although some
epithelial cells and
dendritic cells are capable of its secretion. Some tissues are rich in these cells, and so in this protein. These include the
spleen or
lungs. It occurs intracellularly but is also produced into the extracellular environment where it occurs as a
homodimer or
hexamer. == Clinical significance ==