| Endogenous substrates at Alanine/serine/cysteine transporter 1 | L-cysteine > L-alanine = L-serine > L-threonine |  | 
                                                            
                                                                
                                                                    | Endogenous substrates at Alanine/serine/cysteine transporter 2 | L-alanine = L-serine = L-cysteine (low Vmax) = L-threonine = L-glutamine = L-asparagine >> L-methionine ≅ glycine ≅ L-leucine > L-valine > L-glutamic acid (enhanced at low pH) |  | 
                                                            
                                                                
                                                                    | Endogenous substrates at B0AT1 | L-leucine, L-methionine, L-isoleucine, L-valine > L-asparagine, L-phenylalanine, L-alanine, L-serine > L-threonine, glycine, L-proline | 2 | 
                                                            
                                                                
                                                                    | Endogenous substrates at B0AT2 | L-proline > L-alanine, L-valine, L-methionine, L-leucine > L-isoleucine, L-threonine, L-asparagine, L-serine, L-phenylalanine  > glycine | 2 | 
                                                            
                                                                
                                                                    | Endogenous substrates at B0AT3 | L-alanine, glycine > L-methionine, L-phenylalanine, L-leucine, L-histidine, L-glutamine | 9 | 
                                                            
                                                                
                                                                    | Endogenous substrates at NTT4 | L-leucine, L-methionine, L-proline > L-cysteine, L-alanine, L-glutamine, L-serine > L-histidine, glycine | 11 | 
                                                            
                                                                
                                                                    | Substrates at sodium-coupled neutral amino acid transporter 2 | L-alanine, L-methionine > L-asparagine, L-glutamine, L-serine, L-proline, glycine > L-threonine, L-leucine, L-phenylalanine | 6 | 
                                                            
                                                                
                                                                    | Substrates at sodium-coupled neutral amino acid transporter 4 | L-histidine > L-arginine, L-alanine, L-asparagine, L-lysine > glycine, L-glutamine, L-serine, L-proline, L-leucine, L-phenylalanine | 5 | 
                                                            
                                                                
                                                                    | Substrates at Sodium-coupled neutral amino acid transporter 3 | L-histidine , L-glutamine > L-asparagine, L-alanine > L-glutamic acid | 4 | 
                                                            
                                                                
                                                                    | Substrates at Sodium-coupled neutral amino acid transporter 5 | L-asparagine, L-serine, L-histidine, L-glutamine > glycine, L-alanine | 7 | 
                                                            
                                                                
                                                                    | Substrates at sodium-coupled neutral amino acid transporter 1 | L-alanine > L-serine, L-glutamine, L-asparagine, L-histidine, L-cysteine, L-methionine > glycine, L-threonine, L-proline, L-tyrosine, L-valine | 1 | 
                                                            
                                                                
                                                                    | Amino-acid rank order of potency at CaS receptor | L-phenylalanine, L-tryptophan, L-histidine > L-alanine > L-serine, L-proline, L-glutamic acid > L-aspartic acid (not L-lysine, L-arginine, L-leucine and L-isoleucine) | 3 |