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FIB milling of crystals for MicroED.
(a) Image of select proteinase K crystals at high magnification before milling. The arrow indicates the crystal that was milled. (b) FIB image after milling the top of the crystal. (c) FIB image after milling and cleaning both the top and bottom of the crystal leaving a lamella indicated by an arrow (Reprint from Ref. [52•]).
