Fatty acid-binding protein (FABP) are carrier proteins for fatty acids and other lipophilic substances.  They facilitate the transfer of fatty acids between extra- and intracellular membranes.  FABS coordinate lipid trafficking and signaling in cells[1].  Various FABS differ in their tissue expression. 
- IFABP is intestinal;
- HFABP is heart-type;
- BFABP is brain-type; 
- LFABP is liver-type; 
- AFABP is adipocyte;  
- LMDABP is from flight muscle; 
- TFABP is from testis.
  Relevance 
Some FABSs are linked to metabolic and inflammatory pathways.
  Structural insights 
The  (Hydrophobic,  Polar)[2].  
 3D structures of fatty acid-binding protein
Fatty acid-binding protein 3D structures