CD4 and idiopathic pulmonary fibrosis: Figure 4 shows the main markers expressed exclusively in IPF (CD105, CD142, CD31, CD49e and CD56), only in HP (CD86, MCSPand CD24) as well as those markers that are common between HP and sarcoidosis (CD11c, CD133/1, CD14, CD1c, ROR1, CD209, CD4, CD40, CD44, CD8) and in both BAL samples of IPF and sarcoidosis (CD19 and CD45) BAL samples.