How did the Muslim Brotherhood participate in Egypt’s 2011 revolution?

After some initial hesitation, the Muslim Brotherhood’s senior leadership endorsed the Egyptian uprising against Hosni Mubarak and called on its members to participate in the demonstrations, which ultimately led to Mubarak’s resignation. After Mubarak’s party was dissolved, the Brotherhood became the only major political force in Egypt and dominated the process of drafting a new constitution, leading to opposition by secular parties, Christians, and senior Islamic authorities.