Algae acquire vitamin B12 through a symbiotic relationship with bacteria

@article{Croft2005AlgaeAV,
  title={Algae acquire vitamin B12 through a symbiotic relationship with bacteria},
  author={Martin Tom Croft and Andrew D. Lawrence and Evelyne Raux-Deery and Martin J. Warren and Alison G. Smith},
  journal={Nature},
  year={2005},
  volume={438},
  pages={90-93}
}
Vitamin B12 (cobalamin) was identified nearly 80 years ago as the anti-pernicious anaemia factor in liver, and its importance in human health and disease has resulted in much work on its uptake, cellular transport and utilization. Plants do not contain cobalamin because they have no cobalamin-dependent enzymes. Deficiencies are therefore common in strict vegetarians, and in the elderly, who are susceptible to an autoimmune disorder that prevents its efficient uptake. In contrast, many algae are… 
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