There are any component of gram + bacteria cell wall that can be used as a positive control?

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Matteo Bisi

Teichoic acids? Here's a link to a very old paper discussing the immunomodulation of many cell wall components (is from 1981 but it might be useful)

https://iai.asm.org/content/35/2/523.short

Marwa A. Al-Asady

TAs (teichoic acids)

Jens M Poth

LTA, commercially available from the usual suspects....