Figure 6.

Determination of β_dark by model fitting (described in the Material and Methods, Eqs. (12) – (14)) to GCAPs^−/− recoverin^−/− mouse dim flash responses recorded with LERG-OS in normal and in low Ca²⁺. The dim flash responses are normalized by the saturation amplitude and the stimulus strength to obtain fractional responses. The dim flash responses are population averaged from 10 experiments. Responses were always recorded first in normal and then in low Ca²⁺ solution. The model fits are shown in light blue, and Table 2 shows the parameter values used in modeling.