Superimposition of mFABP4 on hFABP3 with ANS. These views were obtained by superimposing the main-chain atoms of hFABP3 and mFABP4. (a) This view is drawn without ANS binding to mFABP4. mFABP4, hFABP3 and ANS are shown in blue, yellow and red, respectively. Only the number of the corresponding residues between hFABP3 and mFABP4 are shown. (b) This view is drawn without the active residues of mFABP4. hFABP3, ANS in hFABP3, and ANS in mFABP4 are shown in yellow, green and blue, respectively. (c) This stereoview is drawn without ANS binding to hFABP3 and active residues of mFABP4. L104, L115 and L117 of hFABP3 and ANS in mFABP4 are shown in white and blue spheres, respectively.