Northern blots of RNAs isolated from (A) day 9 G/M differentiated FDCP-Mix cells before (lane 1), 30 minutes after (lane 2), and 4 hours after (lane 3) addition of 150 U/mL of IL-3, probed with labeled serpin 2A cDNA and α-actin. (B) Undifferentiated GM-CFC (lane 1), day 4 in vitro macrophage differentiated GM-CFC (lane 2), and day 4 in vitro granulocyte differentiated GM-CFC (lane 3) probed with labeled serpin 2A cDNA and α-actin. (C) Undifferentiated FDCP-Mix cells (lane 1), 15-day gestation fetal liver (lane 2), and adult liver (lane 3) probed with labelled serpin 2A cDNA and α-actin.