The status of measurements and interpretation of the proton structure
function F2 is summarized. The measurements are subjected to DGLAP fits, from
which the gluon density is extracted and a comparison to measurements of F2c is
performed. The longitudinal structure function, FL, is extracted via an
extrapolation of F2. At low Q2, the transition from virtual to real photon
exchange is studied.Comment: Contributed to the proceedings of the EDS99 Conference, Protvino,
Russia, June 28-July 2, 1999. 10 pages including 8 figure
