KEK-TRISTAN. AMY Collaboration. Measurement of forward-backward asymmetry of quarks produced in e+ e- annihilation at sqrt(s) between 50 and 60.8 GeV. Result is for all quarks summed over all flavours. Production angle was defined withrespect to E- and negatively charged JET- fragmented from d, s, b quarks and u, c antiquarks.. Preliminary data seen in PRL 64, 983, (& lt;a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+1573& gt; RED = 1573 & lt;/a& gt;).