Inferred chemoarchitecture pattern of the Periaqueductal gray (PAG)
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| PAGdl | PAGvl | PAGd | PAGm | PAGrl | PAGrm | COM | PRC | |
| alpha2 nAChR |
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| alpha3 nAChR |
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| alpha4-1 nAChR |
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| alpha4-2 nAChR |
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| beta2 nAChR |
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| QSOX | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | |
![]() | molecule present in basal physiological state |
![]() | molecule absent in normal physiological state |


