Source:http://linkedlifedata.com/resource/umls/id/C1166961
GO: Sac-like membranous structures (cisternae) in a chloroplast combined into stacks (grana) and present singly in the stroma (stroma thylakoids or frets) as interconnections between grana. An example of this component is found in Arabidopsis thaliana. [GOC:mtg_sensu, ISBN:0943883999]