HEJNOWICZ, Z Presence in root tips of a thermolabile factor causing the conversion of protochlorophyll to a leuco-compound. [electronic resource] - Nature Oct 1958 - 1023-4 p. digital Publication Type: Journal Article ISSN: 0028-0836 Standard No.: 10.1038/1821023a0 doi Subjects--Topical Terms: ChlorophyllMeristem