What is the primary function of the cell lumen in flame cell? - Quora
Cells - Chloroplast Membranes | Shmoop
WoRMS - World Register of Marine Species - Photogallery
cisterna | biology | Britannica
Lumen (anatomy) - wikidoc
Lumen (anatomy) - Wikipedia
What is Lumen in Biology?
In biology, a lumen (from Latin lumen, meaning 'an opening'; plural lumina) is the inside space of a tubular structure, such as an artery or intestine. - ppt download