During anaphase (A) and telophase (T), APCCdh1 is activated, contributes to the degradation of securin and cyclin B, and mediates the destruction of additional substrates such as Polo-like kinase-1 (Plk1) and Cdc20, which leads to the inactivation of APC/CCdc20. In G1 phase, APC/CCdh1 mediates the destruction of the ubiquitin-conjugating (E2) enzyme UBCH10, and thereby allows for the accumulation of cyclin A, which contributes to the inactivation of APC/CCdh1 at the transition from G1 to S phase.