Khaled Abdel Shafi, the director of the United Nations development program in Gaza, says the U.N. is still trying to assess the damage in Beit Hanoun.

NPR: Israeli Troops Leave Gaza Town in Ruins

Peroxynitrite, a reaction product of nitric oxide and superoxide radicals, has been implicated in N-methyl-D-aspartate receptor-mediated excitotoxic damage.

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