Figure 1. Phosphorylated Ribosome Profiling.
(A) Neurotransmitters and neuromodulators activate a core set of signaling pathways in neurons. Rps6 is a common target of these pathways and is phos-phorylated on five C-terminal residues.
(B) Asparse subpopulationofneuronsis activated in response a stimulus (red cells). Activated neurons show enhanced pS6, and thus, capture of phosphorylated ribosomes enriches for the mRNA expressed in the activated cells. Quantifying the enrichment (IP/input) of a large panel of cell-type-specific marker genes reveals the genes uniquely expressed in the neurons that were activated.