“…However, at the moment there is no determining evidence of the presence of secretagogues in the CSF. There are some studies that report a lack of effect of chromaffin cell transplants (Lindner et al, 2000a(Lindner et al, , 2000b(Lindner et al, , 2003Gulwadi et al, 2002). This discrepancy across studies only remarks the need of standardized techniques for chromaffin cells isolation, cell sources and related procedures, as well as independent groups of animals.…”