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The yield on 10-year JGBs was flat on the day at 0.585 percent.
The 20-year yield rose a basis point to 1.455 percent. Market participants expect support returning to the super long zone when index-following investors begin extending the duration of their holdings as they customarily do at the end of each month.
JGB futures moved in a tight range, edging up early to 145.24 in reaction to gains by US Treasuries on Wednesday. The futures stood unchanged at 145.18 in afternoon trading.