7 As the Court stated in Clarke, 479 U.S. 388, at 409: "We are not faced today with the need to decide whether there are core banking functions beyond those explicitly enumerated in [§36(j)]; it suffices, to decide this case, to hold that the operation of a discount brokerage service is not a core banking function." Significantly, a national bank trust office has been held to be a branch, even though no deposits were received, checks paid, or money lent at the office. St. Louis County Nat. Bank v. Mercantile Trust Co. Nat. Ass'n, 548 F.2d 716 (8th Cir. 1976), cert. denied, 433 U.S. 909 (1977); accord, Boatmen's Nat. Bank of St. Louis v. Hughes, 385 Ill. 431, 53 N.E.2d 403 (1944).