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... y the lack of intrinsic factor in gastric juice leading to Vitamin B12 absorption disorder and resulting in pernicious anemia...
Then, there was absolutely nothing to be done.
Vitamin B12 is a red, cobalt-containing compound. Its atomic structure is extremely complex, consisting of 181 atoms arranged in space in a sprawling, carpet-like pattern.
To synthetically produce Vitamin B12, one would first need to synthesize its various segments and then join them together.
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