We show that the chiral $SU(n)\otimes SU(n)$ flavor symmetry on thenull-plane severely restricts the sea quarks in the baryon octet. It predictslarge asymmetry for the light sea quarks $(u,d,s)$, and universality andabundance for the heavy sea quarks. Further it is shown that existence of theheavy sea quarks constrained by the same symmetry reduces the theoretical valueof the Ellis-Jaffe sum rule substantially.
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