Thousands of Egyptians have taken to the streets in support of parliamentary legislation that bans former top officials from the regime of ousted President Hosni Mubarak from running for president.
The legislation, passed on Thursday, is subject to approval by the country' Supreme Council of the Armed Forces (SCAF), the military council which has been running the country since Mubarak was ousted.
The legislation, which is an amendment to the law governing political rights, would also block the candidacy of anyone who served as prime minister in the last decade of Mubarak's 30-year rule.
Friday's demonstration was called by the Brotherhood, now Egypt's main political force, and more hardline Salafist groups in statements on their websites demanding the "protection of the revolution".
"It really is a pretty festive atmosphere, and there's also a lot of anger at the protest," said Al Jazeera's Sherine Tadros, reffering to the protest in support of parliament's legislation.
"They're telling us that if Omar Suleiman, the former vice president, and Ahmed Shafik, the former prime minister, are allowed to run, and indeed if they win, they will stage another uprising.
"There's a lot of feeling that the revolution has not ended because the main aim of the revolution was to get rid of the regime, not just to get rid of Hosni Mubarak," our correspondent said from Cairo.
Liberal and secular groups also do not wish to see the return of Mubarak-era figures, but they stayed away from Friday's protest.
They have instead called a demonstration on April 20 to denounce what they see as Islamist monopolisation of political life in the country since the revolt.