This paper presents our first measurement of the F2 structure function
in neutral-current, deep inelastic scattering using the ZEUS detector
at HERA, the ep colliding beam facility at DESY. The data correspond
to an integrated luminosity of 24.7 nb-1. Results are presented for da
ta in a range of Q2 from 10 GeV2 to 4700 GeV2 and Bjorken x down to 3.
0 x 10(-4). The F2 structure function increases rapidly as x decreases
.