Another BD and schizophrenia model using human olfactory neuroepithelial cells obtained from four patients with schizophrenia, four patients with BD, and four control patients was developed in 2013 by Chagoyan et al. They analyzed microtubule organization using neuronal progenitors by immunofluorescence method, then quantified the olfactory marker protein (OMP) using western blot, and performed whole-cell recordings of voltage-activated Ca2+ currents by patch-clamp techniques on olfactory sensory neurons obtained from the olfactory neuroepithelium. This evidence concerns the gene OMP and schizophrenia.