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We determine the neutralino and chargino masses in the MSSM at one-loop. Weperform a Feynman diagram calculation in the on-shell renormalization scheme,including quark/squark and lepton/slepton loops. We find generically thecorrections are of order 6%. For a 20 GeV neutralino the corrections can belarger than 20%. The corrections change the region of $\mu,\ M_2,\ \tan\beta$parameter space which is ruled out by LEP data. We demonstrate that, e.g., fora given $\mu$ and $\tan\beta$ the lower limit on the parameter $M_2$ can shiftby 20 GeV.Comment: 11 pages, JHU-TIPAC-930030, PURD-TH-93-13, uses epsf.sty, 6 uuencoded  postscript figures, added one sentence and a referenc

Radiative corrections to neutralino and chargino masses in the minimal supersymmetric model