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doi: 10.1073/pnas.0500367102
You wont find B12 in plants, and animals cant produce it either

Rhodes JS, Best K, Belknap JK, Finn DA, Crabbe JC

Role of vascular smooth muscle cell plasticity and interactions in vessel wall inflammation

doi: 10.1177/1533317513505131 79 MayaS.PrakashT.MadhuK