qRT-PCR using power SYBR green (Thermo Fisher Scientific) was performed as previously described (Smith et al., 2013 (link)) using an Applied Biosystems 7500 Fast Real-Time PCR System. All primers (Table 1) were tested for efficiency using serial dilutions, and results were normalized to 18S RNA levels; data analyses were performed using the standard curve analysis method (Rutledge and Côté, 2003 (link); Smith et al., 2014 (link)). The 18S ribosomal transcript was used as a housekeeping gene as our hypoxia treatments did not alter its expression (Table 2).
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