neural genes expressed in nasopharyngeal specimens
This paper mentions using a cytology brush (not the usual NP swab) to obtain cells from the olfactory epithelium. They obtained and cultured neural precursor cells. Have a look.
Trends in molecular medicine.
&quot;The Olfactory Neural Epithelium as a Tool in Neuroscience&quot;
Joëlle Lavoie, Patricia Gassó Astorga, [...], and Koko Ishizuka
from:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5399677/