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I also got something shown in pic.3 and supposed to be some oil droplet,when I tried to break them I found that was actually a hemisphere type material attached to the coverslip like a 2D circle and sphere like shape in the hanging drop, a small hanging-drop within a large one.Ammonium sulfate was used as precipitant,even I put it to run SDS-PAGE and it was (may be a quasi-crystal of) the protein of interest.