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Susan F. Wood said she left her post promoting women's health at the FDA because of the agency's decision last week indefinitely delaying approval of over-the-counter sales of the Plan B pill until it could hear more public comment and study further.

It reignited the sharp exchanges that followed FDA Commissioner Lester M. Crawford's announcement to delay approval of over-the- counter sales even though the agency had concluded the pill could be sold safely to women 17 and older.

Joining the fray was Sen. Edward M. Kennedy, a Massachusetts Democrat, who praised Wood's resignation as "courageous" while expressing "disappointment" with the FDA's delay.