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Human and murine VEGF production by selected clones. Five clones were selected: two clones expressing either mouse (mVlow) or human (hVlow) VEGF at low levels and three clones expressing either mouse (mVhigh) or human (hVhigh1, hVhigh2) VEGF at high levels. In vitro VEGF expression was measured by ELISA (A) and further confirmed by quantitative reverse-transcriptase polymerase chain reaction (qRT-PCR) (B). **p<0.01.
