GATA6 and peritonitis: Furthermore, there appears to be a phase of at least 11 days during severe peritonitis where the cavity does not support expression of F4/80 that, given the dependence of F4/80 expression by LPM on GATA6 and retinoic acid5,22,23 (Fig. 2a, b and Supplementary Fig. 2f), suggests severe peritoneal inflammation leads to a protracted but ultimately transient loss in retinoic acid availability.