Assertion: bilirubin's effect | /r/HasProperty | observed at these time points
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Source sentences:
text: The HBMEC line was exposed to UCB for 1 h for mRNA analysis, and for 4 h for cytokine release quantification, since the maximum effects of UCB alone in interleukin-6 expression and secretion were observed at these time points (Palmela et al., 2011).