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NameCurrent message text
 h English (en)===Chemical reactions===
[[File:Various reduced forms of Cyanocobalamin.jpg|thumb|Reduced forms of Cyanocobalamin, with a Co(I) (top), Co(II) (middle), and Co(III) (bottom)]]
In the cobalamins, [[cobalt]] normally exists in the trivalent state, Co(III). However, under reducing conditions, the cobalt center is reduced to Co(II) or even Co(I), which are usually denoted as {{chem|B|12r}} and {{chem|B|12s}}, for reduced and super reduced, respectively.
 h Japanese (ja)===化学反応===
[[File:Various reduced forms of Cyanocobalamin.jpg|thumb|Co(I)(上)、Co(II)(中)、Co(III)(下)の還元型シアノコバラミン]]
コバラミンでは、[[cobalt/ja|コバルト]]は通常3価のCo(III)の状態で存在する。しかし、還元条件下では、コバルト中心はCo(II)、あるいはCo(I)に還元され、通常、それぞれ還元型、超還元型を表す{{chem|B|12r}}、{{chem|B|12s}}と表記される。