Tarek al-Bishry, the chairman of the constitutional panel, is a respected judge who criticised former president Hosni Mubarak and is regarded as moderate in his views. But he has been associated with Al-Wasat, an offshoot of the Brotherhood.
He has selected a committee made up mainly of judges and politicians, including a judge who is a Coptic Christian, but also a former Muslim Brotherhood MP. There are no women.
Wael Abbas, the best-known human rights blogger in Egypt, who was sentenced to prison by the Mubarak regime last year, said it was a "worrying" choice.
"There is no such thing as a moderate Islamist," he said. "We want a secular state that respects all religions and which belongs to all religions."
Mr Mubarak banned the Muslim Brotherhood and often warned that his regime was a bulwark against Islamic fundamentalism, a claim repeatedly attacked by protesters on Tahrir Square in the days leading up to his removal from office.
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"The army seems to have made some sort of deal with the Muslim Brotherhood."
