Hi, I've using the Nano powered with regulated 5V into pin 27.
Now, in the UNO specs it says
"5V.This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it."
So can't I supply the UNO with regulated 5V into this pin?