  We present a determination of the CKM matrix element |Vub| based on the
analysis of semileptonic B decays from a sample of 88 million Upsilon(4S)
decays collected with the BABAR detector at the PEP-II e+e- storage ring.
Charmless semileptonic B decays are selected using measurements of the electron
energy and the invariant mass squared of the electron-neutrino pair. We obtain
|Vub| = (3.95 +/- 0.26 ^{+0.58}_{-0.42} +/- 0.25) x 10^{-3}, where the errors
represent experimental uncertainties, heavy quark parameter uncertainties, and
theoretical uncertainties, respectively.
