Fig. 2From: Expression, purification and biological characterization of the extracellular domain of CD40 from Pichia pastoris Fermentation of the CD40-N-expressing strain. a Growth curve of the Pichia culture. b Time course of CD40-N expression in the bioreactor. Fermentation supernatants were collected at the indicated times after methanol induction, and recombinant CD40-N protein is indicated with an arrowBack to article page