The typical branches of power in the world are, - Executive power - Legislative power - Judicial power
Many other countries have additional branches with constitutional level power, for example - Prosecutory (Argentina has it) - Electoral - Auditory etc.
Also, sometimes inside the legislative power, there are commissions formed with part of the legislators where laws has to be approved aside of being approved by the majority of the Congress, for example,
- Constitutional matters
- Free speech
- Human rights
- Science etc
Has there ever been any government in the world where a science commission, instead of being a commission of the legislative power, was a branch of power at the constitutional level? Meaning that any law also had to be approved also by an independent from the legislature science commission?