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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: Pharmacol Biochem Behav. 2021 Nov 6;212:173294. doi: 10.1016/j.pbb.2021.173294

Table 1.

Comparison of hippocampal opioid system in mouse vs rat.

Mossy fiber pathway Sex differences Cycle differences observed Other

LEnk Mouse ≪ rat Mouse – no CCK colocalization
Rat - yes Mouse ≫ rat
Dyn Mouse ≪ rat Mouse – no Increase in OVX mouse lacking ERα + given E2 replacement
Rat - yes
MOR in PARV dendrites in DG hilus Mouse – no
Rat -yes