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. 2012 Jun 10;7:52. doi: 10.1186/1749-8090-7-52

Table 1.

Composition of HTK solution

  mmol/L
Sodium chloride
15
Potassium chloride
9
Potassium hydrogen 2-ketoglutarate
1
Magnesium chloride 6 H2O
4
Histidine HCl H2O
18
Histidine
180
Tryptophan
2
Mannitol
30
Calcium chloride 2H2O
0.015
Osmolarity
310
pH at 25 °C (77 °F) 7.02-7.2

Relative costs decrease from class 1 through class 7.