Drosophila egg chambers were prepared as previously described with minor modifications [24]. Briefly, flies expressing the microtubule-associated protein, Jupiter, endogenously tagged with eGFP were fattened on dry yeast at 25°C for one day before dissection [25]. Their ovaries were dissected at room temperature in a drop of Voltalef oil 10S (VWR, 24627.188) on a cover glass (22 × 50, thickness No. 1.5, VWR, 631-0138) and individual egg chambers were isolated and positioned at the centre of the coverslip.
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