Quantitation of starch and adp glucose pyrophosphorylase in non embryogenic cells and embryogenic cell clusters from carrot suspension cultures Wurtele, E.S.; Keller, G.L.; Nikolau, B.J.; Ulrich, T.H. Journal of Plant Physiology 132(6): 683-689 1988 https://eurekamag.com/research/006/240/006240065.php