@S06072@ of @S06082@ at which the @R05156@ is equal to one half of the limiting rate (maximum rate).
  1. Also called the Michaelis concentration
  2. The Michaelis constant (Michaelis concentration) may be used only when @M03892@ is obeyed.
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 981 [Terms] [Paper]