Sentence 1: Interleukins are a group of cytokines ( secreted proteins and signal molecules ) that were first saw to be expressed by white blood cells ( leukocytes ) .
Sentence 2: Interleukins are a group of cytokines ( expressed proteins and signal molecules ) that were first seen to be secreted by white blood cells ( leukocytes ) .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?