NMDA-receptors

[Christian]

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Hi,

As a layman, I would like to know if there are different subgroups of
NMDA-receptors in different parts of the human body. Most of all, I
would like to know if the NMDA-receptors in the human cochlea differ
from the NMDA-receptors in the brain. Is there any theoretical
possibility to create an NMDA-antagonist that only works in the
cochlea while avoiding side-effects in the brain?

Thank you very much for your help!

Regards,
Christian