Figure 4From: Alveolar macrophages of GM-CSF knockout mice exhibit mixed M1 and M2 phenotypesHuman alveolar macrophages from healthy donors produce activin A in response to IFNγ. Activin A protein is increased in conditioned media from human alveolar macrophages cultured with IFNγ (1000 U/ml) for 24 hours in vitro.Back to article page