Refer to the figure showing the reproductive cycle of a typical lytic virus. 
Which number identifies an early protein that stimulates late gene production?
Definitions:
Thalamus
Structure in the forebrain that acts as a relay center for incoming sensory information and outgoing motor information.
Neuromatrix Theory
A theory proposing that pain is a multidimensional experience produced by the brain, involving various neural networks rather than direct sensory input alone.
Melzack
Refers to Ronald Melzack, a Canadian psychologist well-known for co-creating the gate control theory of pain.
Gate Control Theory
A theory proposing that the spinal cord contains a neurological "gate" that either blocks pain signals or allows them to continue to the brain.
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