Reading the tea leaves about what happens inside Iran's government is always difficult. So it will likely be a little while before the importance of this story becomes clear.
The Associated Press writes that:
The head of Iran's nuclear agency has resigned, an Iranian news agency reported Thursday, a move that may have been connected to the country's post-election turmoil.
Gholam Reza Aghazadeh gave no reason for his resignation, according the semi-official ISNA news agency. But Aghazadeh has long been close to opposition leader Mir Hossein Mousavi, who claims to be the victor in June 12 presidential elections and says the government of President Mahmoud Ahmadinejad is illegitimate.