Expression levels of recombinant LZ-8 (A) and cell masses (B) of L. lactis NZ9000(pNZSLZ) cells cultured in various media. (A) Lane M, broad-range protein molecular mass markers; lanes 1 to 12, supernatants of L. lactis NZ9000(pNZSLZ) after 4, 6, or 8 h of culture in GM17, GM17B, 2GM17B, or 2NGM17B medium. (B) The circles, reverse triangles, squares, and diamonds represent growth in GM17, GM17B, 2GM17B, and 2NGM17B medium, respectively. OD600, optical density at 600 nm.