( 1 ) intracellular and extracellular recordings were made from ca1 pyramidal neurons in an in vitro rat hippocampal slice preparation , while [ d-ala2 , d-leu5 ] enkephalin ( dadl ) was applied by perfusion at a known concentration ( 1 to 5 x 10-7 m ) , in a small droplet , or by iontophoresis into the cellular and dendritic layers of the slice .
C0027882
neurons
C0011305
dendritic