Paraffin sections of 10-DAP kernels were prepared according to a previously described protocol [73 (link)]. The samples were treated with xylene, embedded in paraffin wax via infiltration, and cut into 10 μm-thick sections with a Thermo Scientific HM 325 rotary microtome. The sections were stained with toluidine blue (Sinopharm Chemical Reagent Co., Ltd) and examined under a ZEISS Stemi 508 Stereo Microscope (Germany) and a ZEISS Axio Scope A1 Microscope (Germany).
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