Depreciation is not included IN FIGURING One's "PURCHASE EXPENSES OR deductions". It is a separate adjustment.
After entering your home sale, you'll be asked if there was any unqualified use. You'll be asked to enter any depreciation claimed, in the past. That comes from your own records. You'll usually find it on line 18 of Schedule E. TurboTax may have created a "Depreciation Report" worksheet showing your accumulated depreciation.