NOS2 and Salmonella Infections: However, using morpholinos and L-NAME or L-NMMA (pan-NOS pharmacologic inhibitors), Hall et al. determined that Nos2a protein is required downstream of C/ebpβ to expand the HSPC population (as evidenced by increased c-myb and runx1 expression) and promote myeloid differentiation in response to Salmonella infection [50].