Perform the indicated operations and simplify the expression. 
Definitions:
Structural Proteins
Proteins that play a role in building and maintaining the three-dimensional structures of cells, tissues, and organs, contributing to their shape and structural integrity.
Hormones
Chemical messengers produced by endocrine glands that travel through the bloodstream to target organs, regulating various bodily functions and processes.
Neurotransmitters
Chemicals that transmit signals across a synapse from one neuron to another neuron or to a target cell in a muscle or gland.
Synaptic Cleft
Gap separating the neuronal presynaptic membrane from the postsynaptic membrane.
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