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Effect of ECFC-CM on PAEC growth after 3 days in hyperoxia. Preterm ECFC-CMRA or ECFC-CM50 restore PAEC growth in hyperoxia to that of RA controls. Term ECFC-CMRA or ECFC-CM50 augment PAEC growth in hyperoxia well above PAEC growth in RA. HUVEC-CMRA had no effect on PAEC growth. *P < 0.05, **P < 0.01.
