Table:
Mg2+

Co2+

km (μM)

Vmax (pmol/min/108 cells)

km (μM)

Vmax (pmol/min/108 cells)

Ki(Mg2+) (μM)

MgtE

-

-

82[4] (at 37 °C)

354[4] (at 37 °C)

50[4] (at 37 °C)

CorA

15[38] (at 20 °C)

250[38] (at 20 °C)

30[2] (at 22 °C)

500[2] (at 22 °C)

10[2] (at 22 °C)

For the cell at row 2 and column 3 in this table, provide its content. Output the target cell content as JSON in the format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.

The target cell value in row 2 and column 3 is {"row_id":"2", "column_id":"3", "cell_value":"vmax"}.