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COL1A1 is expressed by cells of myeloid origin and AMs. COL1A1 expression in fresh BAL cultures from a Non-IPF patient with CTD-ILD, stained with rabbit anti-human-COL1A1 and ToPro-633 nuclear stain and (A) mouse isotype control, (B) mouse anti-CD45 and (C) mouse anti-CD163 antibodies. Arrows indicate CD45 and CD163 positive cells expressing COL1A1.
