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Yes primary mouse keratinocytes grow well in this media when you reduce the CaCl2 concentration to 0.025 mM - 0.05 mM CaCl2 (optimal Ca concentration for primary human keratinocytes is 0.06 mM).
If you are growing our NHEK in PromoCell Keratinocyte Growth Medium 2 (C-20011) or Growth Medium 3 (C-20021) you don't need any feeder cells. The cells will grow as a monolayer in conventional tissue culture flasks.