Indicate whether each of the following descriptions is shared (S) or not shared (N) between macrophages and neutrophils in destroying invading pathogens in vertebrates. Your answer would be a four-letter string composed of letters S and N only, e.g. SSSS.
( ) They use a respiratory burst and create toxic reactive oxygen species to kill engulfed pathogens.
( ) They are normally found in most tissues even before pathogen invasion.
( ) They are long-lived and normally survive long after activation.
( ) They secrete pro-inflammatory cytokines upon encountering invading pathogens.