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We study the process of formation of quark phases in protoneutron stars.After calculating the phase transition between nucleonic matter and the 2SCphase at fixed entropy and lepton fraction, we show that an unpairingtransition between the 2SC phase and the normal quark phase occurs for lowlepton fractions. We then calculate the process of diffusion of neutrinos inprotoneutron stars and show that for intermediate values of the mass of thestar, the deleptonization triggers the phase transition between the two quarkphases after a temporal delay of a few seconds. In less massive stars insteadonly the normal quark phase is formed at the end of the deleptonization stage.We also discuss the possible astrophysical implications of our scenario.

Formation of quark phases in protoneutron stars: the transition from the 2SC to the normal quark phase