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Growth factors from LA7 conditioned medium separated by SDS–PAGE. (a) Proteins reacting with antibodies to TGFα. One band co‐migrates with the synthetic TGFα marker, and several bands are evident at higher molecular weights. (b) Proteins reacting with antibodies to bFGF. One faint band co‐migrates with a minor band of the bFGF standard, and another band of ∼31 kDa is visible.
