of bright, red galaxies in two $z\sim1.6$ clusters, but a corresponding lack of faint, red galaxies. However, in contrast to these results, @Andreon2014a found a well-populated red sequence down to $\sim10^{10}$ in a $z\sim1.8$ cluster and @Lee2015 find that there is no difference in the quiescent fraction between cluster and field environments at $z>1$, with a large variation between individual clusters. Therefore the mass dependence of quiescent galaxies needs to be analysed in a larger sample of protoclusters to draw firm conclusions. In @VanderBurg2013 clusters at $z\sim1$ were also shown to have an increased quiescent fraction compared to the field. The quiescent fractions in 7C are similar to the $z\sim1$ fractions at high masses ($M>10^{10.5}$), which is further evidence that 7C is already a very mature structure, more similar to $z=1$ clusters than higher redshift protoclusters. The quiescent fraction at lower masses is much higher at $z\sim1$ than in 7C. This may suggest a build up of the low mass end of the red sequence in clusters from $z=1.6$ to $z=1$.

                                         CARLAJ1753          ClG0218             UDS        
  ----------------------------------- ----------------- ----------------- ----------------- --
  $f_{\rm red}$                        $0.66 \pm 0.13$   $0.48 \pm 0.15$   $0.27 \pm 0.01$  
  $f_{\rm Q}$ ($J \le 23.6$)           $0.50 \pm 0.09$   $0.30 \pm 