This paper describes neurological deficits that were treated with B-12 and an immunosupressant:
I was hoping someone with access to this paper might let us know if the imunosuppressant used was rapamycin, by any chance:
https://www.science.org/doi/10.1126/scitranslmed.adl3758
This is the medscape article about it:
https://www.medscape.com/viewarticle/form-b12-deficiency-affecting-central-nervous-system-may-be-2024a1000c5q?ecd=WNL_trdalrt_pos1_240702_etid6642192&uac=306510BR&impID=6642192
thanks