Haven't gotten UCSF's info packet yet, so I may be way off-base on this, but Minnesota said you have to have > C on all courses and I assume most schools are the same. That's a 2.0 on AADSAS, which gives you plenty of room for error! I suppose if all of your grades were that low, they may reconsider, but I wouldn't stress on 1 low grade post-acceptance (provided it's above the base acceptable grade they'll tell us about in "the packet").