They are difficult to iso
They are difficult to isolate, and it was not until 1954 that Daniel Arnon obtained them intact from spinach. In 1865, Julius Sachs discovered the importance of these subcellular bodies, which consist of lamellae, clusters of which are known as grana. FTP, identify these lens-shaped organelles, stacks of thylakoids surrounded by stroma in which photosynthesis takes place.
They are difficult to isolate, and it was not until 1954 that Daniel Arnon obtained them intact from spinach.
{chloroplast}s