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EH and LH experiments. (A) EH experiment, in which D. melanogaster began life in 10 kPa PO2 and were moved to 21 kPa PO2 after a set number of hours of development, indicated on the x-axis. (B) LH experiment, in which flies began life in 21 kPa PO2 and were moved to 10 kPa PO2 after the number of hours of development shown on the x-axis. Groups marked with ‘a’ are significantly different from those that experienced constant normoxia, by a Bonferroni-corrected a priori comparison.
