Non-exchangeability of 28 Mg with chlorophyll a.
D002734:Chlorophyll / Q000737:chemistry* / Q000031:analogs & derivatives; D000077194:Chlorophyll A; D008274:Magnesium / Q000737:chemistry*
D002734:Chlorophyll; C085815:chlorophyll a'; D008274:Magnesium; D000077194:Chlorophyll A
CHLOROPHYLL/chemistry; MAGNESIUM/chemistry