ATCC	American Type Culture Collection
A-B	Apical-t-o-basolateral
B-A	Basolateral-to-apical
BA	Bioavailability
BCS	Biopharmaceutics Classification System
DMEM	Dulbecco’s Modified Eagle Medium
DSMZ	Deutsche Sammlung von Mikroorganismen und Zellkulturen
EBSS	Earle’s Balanced Salt Solution
ECACC	European Collection of Authenticated Cell Cultures
EMA	European Medicines Agency
EMEM	Eagle’s minimum essential medium
fa	% fraction dose absorbed in humans [%]
FBS	Fetal bovine serum
FDA	Food and Drug Administration
HEPES	4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
HP-IS	High-permeability internal standard
LP-IS	Low-permeability internal standard
MES	2-(N-morpholino)ethanesulfonic acid
MTT test	3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide test
NEAA	Non-essential amino acids
Papp	The apparent permeability coefficients [cm/s]
PBS	Phosphate Buffered Saline
TEER	Transepithelial electrical resistance