The cholinergic stimulation of the central amygdala modifying the tonic immobility response and antinociception in guinea pigs depends on the ventrolateral periaqueductal gray - Leite-Panissi, Christie Ramos Andrade; Coimbra, Norberto Cysne; Menescal-de-Oliveira, Leda (Brain Research Bulletin, 2003)