Arabidopsis Proteins Journal Article Research Support, Non-U.S. Gov't ATG8 ATG8 protein, Arabidopsis ATG8-interacting motif Autophagy-Related Protein 8 Family Carrier Proteins Cereal Research Support, U.S. Gov't, Non-P.H.S. Review Seed Storage Proteins autophagy autophagy receptor endomembrane system nanobody protein body protein sorting protein storage vacuole seed storage proteins selective autophagy targeted protein degradation trafficking pathways vacuole