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For galaxies with SSFR smaller than this critical point, the hosting halo mass increases, implying that the environmental quenching effect has taken place as early as z ~ 2. On the other hand, for galaxies with SSFR above the threshold, the hosting halo mass also increases, suggesting that some mechanism operating in denser environment may also boost the SFR of galaxies. (Lin et al. 2012, ApJ, 756, 71.)