Plasma concentration/µM CSF concentration/µM ISF concentration/µM Human1 Rat2 Human3 Rabbit4 Rat5 Mice6 Human1 Human7 Rat2, c Rat1, 2 Human3 Rabbit4 Rat5 Mice6 Rabbit4 Rabbit8 Rabbit9 Rat5 Mice6 Gln 619 641 868 834 598 863 780 552 583 524 517 250 547 159 193 80 Asn 112 55 Trace 14 16 3 7.8 4.3 1.4 Ala 330 489a 382 430 408 27 18.6 34a 39 85.4 57 15 19 15 7.7 9.3 Ser 149 196 140 263 247 109 28.9 30.4 79 80 30 116 62.3 37 34 24.9 9.8 Gly 249 221 283 246 1.3 6.4 20 15 6 34 7.8 Pro 212 60 Trace 0.6 4.2 1.8 Thr 142 166 113 28.5 27.7 36 22 3.5 Val 222 430 309 191 173 14 16.1 78 47 20 14 9.4 13 12.5 7.4 2.9 Leu 109 432 155 81 127 13.1 11.9 66 42 15 7 6.6 9 1.5 Ile 61 77 101 5.2 4.7 6 7 9 Tyr 70 73 43 54 7.3 8.1 10 7 7.2 5 0.7 His 85 80 59 10.8 12.0 12 8.9 1.2 Lys 158 290 171 137 321 19.7 22.0 120 87 21 8 46 19 10 Arg 80 94 81 227 103 17 18.6 55 46 22 32.5 18 6.9 3.2 Glu 83 61 56 159.6 37 7.2 8.7 26 10 11.4 21 4 4.3 3.4 2.9 4.1 Asp 7 33.8 2.4 1.5 5.8 0.6 0.5 1.7 Phe 71 64 45 8.3 8.2 10 7 6 Met 41 28 30 2.8 2.6 3 3 Trp 62