Recall that the template for a Hill function is
A x n a n + x n {\displaystyle {\frac {Ax^{n}}{a^{n}+x^{n}}}} .
The half-maximal activation level is obtained when x = a {\displaystyle x=a} . In our case here, the half-max is reached at x = 1 {\displaystyle x=1} .
