No. 573 is an NPC in Xenosaga Episode II. He is the 573rd U.R.T.V. to be born at the Yuriev Institute.
No. 573 can be found in the first exterior area of the Yuriev Institute, near the door to the building. If talked to as Jr., he wonders if "Rubedo and the others" will be infected by U-DO. If any other party member is leading, he says that three standard U.R.T.V.s were infected during training the previous day, and that they'll never return to normal.
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"Three units were infected with U-DO waves during training yesterday."
"The infected units will never return to normal."
"Will Rubedo and the others be infected as well?"
Jr. stands near No. 573.