Mouse cells were isolated as described previously18. Briefly, flushed mouse lung tissue was minced and digested with 3 ml Collagenase A (catalog no. 10103586001, Roche; 1 mg ml−1 in PBS) in a 37 °C water bath for 1 h. Mixtures were titrated with no. 18-G needles and then pipetted through a 40-μm disposable cell strainer. After centrifuging at 300g for 5 min and washing with PBS, isolated cells were treated with red blood cell lysis buffer (catalog no. 00-4300-54; eBioscience) for 5 min on ice to lyse red blood cells.
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