The Associated Press reports:

The Oklahoma Supreme Court ruled Monday that a proposal that would grant "personhood" rights to human embryos is unconstitutional.

The state's highest court ruled that a proposed constitutional amendment that would define a fertilized human egg as a person violates a 1992 U.S. Supreme Court decision and "is clearly unconstitutional." Supporters of the personhood amendment are trying to gather enough signatures to put it before Oklahoma voters on the November ballot.