Qualities of nucleons,such as the fundamental parameter mass,might be modified in extreme conditions relative to those of isolated nucleons.We show the ratio of the EMC-effect tagged nucleon mass to that of the free one(m*/m);these values are derived from the nuclear structure function ratio between heavy nuclei and deuterium measured in the electron Deep Inelastic Scattering(DIS)reaction in 0.3 ≤ x ≤0.7.The increase in m*/m with A-1/3 is phenomenologically interpreted via the release of a color-singlet cluster formed by sea quarks and gluons in bound nucleons holding high momentum in the nucleus,from which the mass and fraction of non-nucleonic components in nuclei can be deduced.The mass of color-singlet clusters released per short range correlated(SRC)proton in the high momentum region(k ＞ 2 fm-1)is extracted to be 16.890±0.016 MeV/c2,which evidences the possibility of a light neutral boson and quantized mass of matter.