Multiple macrophage products Paradoxically, the list of macrophage secretory products
(Table I) has not grown much longer in the lastfew years, despite con-tinual entries. The
explanation is the increased molecular definition of entities previously known only as
activities. This has permitted two insights: that a single macrophage product can have
diverse activities, and that a single activity can reflect the action ofmany macrophage
products. Thus, while earlier reviews