The biome shown in this picture is: 
Definitions:
Neurotrophic Factor
Chemical compound that supports growth and differentiation in developing neurons and may act to keep certain neurons alive in adulthood.
Brain-derived
Often a prefix to substances or factors that originate from the brain, influencing various neurological functions and development.
Chemicals
Substances with distinct molecular compositions that are used or produced in chemical processes.
Brain-derived Neurotrophic Factor
A protein in the brain and nervous system that promotes the survival, growth, and maintenance of neurons.
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