CREATE TABLE table_20604 ("Missouri vs." TEXT, "Overall Record" TEXT, "at Columbia" TEXT, "at Opponents Venue" TEXT, "at Neutral Site" TEXT, "Last 5 Meetings" TEXT, "Last 10 Meetings" TEXT, "Current Streak" TEXT)

Against which team does Missouri Tigers have a record of mu, 2-1 at a neutral site?
SELECT "Missouri vs." FROM table_20604 WHERE "at Neutral Site" = 'MU, 2-1'
SELECT "Missouri vs." FROM "table_20604" WHERE "at Neutral Site" = 'MU, 2-1'