IGF1 and acute respiratory distress syndrome: There is apparent discrepancy between the alveolar macrophage data where we see both control and FP‐ARDS producing IGF‐I mRNA and the lung biopsy specimens where only FP‐ARDS biopsy specimens contain IGF‐I mRNA may be explained by the fact that macrophages may be a relatively minor source of lung IGF‐I at all times, whereas in FP‐ARDS a variety of other cells (including epithelial cells) may actively produce IGF‐I.