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A) Live/dead staining of 3D printed cardiomyocyte-laden GelMA constructs having 0% and 0.5% CPO, that were cultured under hypoxic conditions and 0% CPO that were cultured under normoxic condition for three, five and seven days. Scale bar is 200 μm. B) Quantification of cell viability showing significant difference between constructs (*, p<0.05; **, p<0.01).
