It was an extremely youthful Saints team, Eric Djemba-Djemba effectively on babysitting duty as Thomas Reilly and Anton Brady were the only other players who have featured for the first team this season.
Jamie Hamilton looked to have given the Jags all three points with a goal after a quarter of an hour, but Scullion scored in stoppage time to snatch a draw.
The youths are in action again on Saturday when they host Rangers in the semi-finals of the SFA Youth Cup.
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