Andrews gives Ulster a fortunate victory
Dragons 17 Ulster 27
John Andrew's late try secured 14-man Ulster a crucial win against Newport Gwent Dragons. Ulster twice opened a seven-point lead through Craig Gilroy and Jarrod Payne.
But an a week when the Welsh Rugby Union announced they intend to take over the region, Dragons hit back with scores by Rynard Landman and Ollie Griffiths.
Paddy Jackson's penalty edged Ulster ahead before Rodney Ah You was shown a red card and Andrew then claimed the crucial touchdown.
Ah You was dismissed after he was adjudged to have made an illegal tackle on Dragons full-back Carl Meyer.
The win means Ulster's stay fourth in the table, but their failure to gain a bonus point means fifth-placed Scarlets have reduced their cushion to three points. Les Kiss' men are two points behind Munster.
Meanwhile, Wales fly-half Rhys Patchell scored two tries within 30minutes of his return after three months out injured as the Scarlets beat Edinburgh 26-10.
The 23-year-old fly-half, who has four Wales caps, sprained an ankle in a win over Cardiff Blues on 1 January.
Scarlets earned a bonus point before half time thanks to further tries from Wyn Jones and Olympian James Davies.
Edinburgh have won only one of their last 10 matches in the Pro12 and only four games all season.
Scarlets head coach Wayne Pivac named seven returning internationals.
Dragons - C Meyer; A Hughes, T Morgan, S Beard, T Prydie (D Jones 77); A O'Brien, C Davies (S Pretorious 67); S Hobbs (P Price 55), R Buckley (D Harris 77), B Harris, N Crosswell (M Screech 67), R Landman, O Griffiths, N Cudd (H Keddie 64), L Evans (capt).
Ulster - J Payne; C Gilroy, L Marshall, D Cave (Jackson 48), C Piutau, S Olding, R Pienaar; (J Stockdale 77), A Warwick (C Black 60), R Herring (capt) (J Andrew 72), W Herbst (R Ah You 24), K Treadwell, A O'Connor (C Ross 60), I Henderson (R Diack 70), C Henry, S Reidy.