Researchers identify a new receptor complex in the brain.
Literal
Researchers [topic-は] brain [possessive-の] new receptor [possessive-の] complex [object-を] identify.
A scientific news headline. 受容器 (receptor) and 複合体 (complex) are biology terminology. 識別する (identify/distinguish) is formal scientific vocabulary. 頭脳 (brain, formal) is used rather than the more common 脳. The sentence reads like a translated abstract.