May play a role in mediating neutrophil activation and chemotaxis. Isoform 1 is expressed in normal mouse B and T-lymphocytes and in transformed B-cells but not (or in smaller amounts) in nine T-lymphoma lines tested. Isoform 2 is expressed in non-lymphoid cell lines (myocytes, stromal cells, fibroblasts). Phosphorylated by casein kinase II, protein kinase C and MAPKAPK2. Phosphorylation by PKC induces translocation from membrane to cytoplasm. Phosphorylation by MAPKAPK2 may regulate neutrophil chemotaxis.