Abstract
It is shown that the confinement effect that is significant at great distances from the nucleon center is capable of inducing the appreciable quark helicity flip. A simultaneous change in projections of the orbital angular momentum of quarks on the direction of their motion, which follows from the Dirac equation, ensures the conservation of the total angular momentum of the system. Thus, a part of the proton spin, measured in experiments with deep inelastic scattering of leptons, may be hidden in the orbital angular momentum of quarks.
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