The side of the
Golgi apparatus which faces the
rough endoplasmic reticulum, where
vesicles budding off of the rough endoplasmic reticulum fuse to the Golgi apparatus. Also called the "cis" side of the Golgi apparatus.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.