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En face tracheal sections. X-Gal stained en face sections of trachea (distal to the cannula tip) from all six ferrets (A-F), following intra-tracheal delivery of 150 μl of 0.1% LPC followed one hour later by 500 μl LV-LacZ, demonstrate low levels of patchy LacZ gene transduction at 1 week (20× magnification).
