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![Figure 2 from Nuclear magnetic resonance studies of the biosynthesis of vitamin B12. The origin of the methyl groups on the corrin ring. | Semantic Scholar Figure 2 from Nuclear magnetic resonance studies of the biosynthesis of vitamin B12. The origin of the methyl groups on the corrin ring. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/7032e39488e7cd4a6c25edf78ed6d89c8268c2d2/3-Figure2-1.png)
Figure 2 from Nuclear magnetic resonance studies of the biosynthesis of vitamin B12. The origin of the methyl groups on the corrin ring. | Semantic Scholar
![Figure 2 from Nuclear magnetic resonance studies of the biosynthesis of vitamin B12. The origin of the methyl groups on the corrin ring. | Semantic Scholar Figure 2 from Nuclear magnetic resonance studies of the biosynthesis of vitamin B12. The origin of the methyl groups on the corrin ring. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/7032e39488e7cd4a6c25edf78ed6d89c8268c2d2/2-Figure1-1.png)