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. Author manuscript; available in PMC: 2016 Oct 27.
Published in final edited form as: Adv Enzyme Res. 2014 Mar;2(1):39–48. doi: 10.4236/aer.2014.21004

Figure 1.

Figure 1

Structures of folic acid, aminopterin and methotrexate. The arrow indicates the point of cleavage. The stars indicate the points where aminopterin and methotrexate differ from folic acid.