A method of producing an antibody to a Aß fragment of amyloid precursor protein in a large-scale production cell culture comprising the steps of: providing a cell culture comprising; mammalian cells that contain a gene encoding the antibody, which gene is expressed under condition of cell culture; and a medium containing glutamine and having a medium characteristic selected from the group consisting of: (i) a cumulative amino acid amount per unit volume greater than about 70 mM, (ii) a molar cumulative glutamine to cumulative asparagine ratio of less than about 2, (iii) a molar cumulative glutamine to cumulative total amino acid ratio of less than about 0.2, (iv) a molar cumulative inorganic ion to cumulative total amino acid ratio between about 0.4 to 1, (v) a combined cumulative amount of glutamine and asparagine per unit volume of greater than about 16 mM, and combinations thereof; maintaining said culture in an initial growth phase under a first set of culture conditions for a first period of time sufficient to allow said cells to reproduce to a viable cell density within a range of about 20%-80% of the maximal possible viable cell density if said culture were maintained under the first set of culture conditions; changing at least one of the culture conditions, so that a second set of culture conditions is applied and a metabolic shift occurs in the culture, wherein said metabolic shift is characterised by a reduction in the ratio of a specific lactate production rate to a specific glucose consumption rate; maintaining said culture for a second period of time under the second set of conditions and for a second period of time so that the antibody accumulates in the cell culture. providing a cell culture comprising; mammalian cells that contain a gene encoding the antibody, which gene is expressed under condition of cell culture; and a medium containing glutamine and having a medium characteristic selected from the group consisting of: (i) a cumulative amino acid amount per unit volume greater than about 70 mM, (ii) a molar cumulative glutamine to cumulative asparagine ratio of less than about 2, (iii) a molar cumulative glutamine to cumulative total amino acid ratio of less than about 0.2, (iv) a molar cumulative inorganic ion to cumulative total amino acid ratio between about 0.4 to 1, (v) a combined cumulative amount of glutamine and asparagine per unit volume of greater than about 16 mM, and combinations thereof; mammalian cells that contain a gene encoding the antibody, which gene is expressed under condition of cell culture; and a medium containing glutamine and having a medium characteristic selected from the group consisting of: (i) a cumulative amino acid amount per unit volume greater than about 70 mM, (ii) a molar cumulative glutamine to cumulative asparagine ratio of less than about 2, (iii) a molar cumulative glutamine to cumulative total amino acid ratio of less than about 0.2, (iv) a molar cumulative inorganic ion to cumulative total amino acid ratio between about 0.4 to 1, (v) a combined cumulative amount of glutamine and asparagine per unit volume of greater than about 16 mM, and combinations thereof; maintaining said culture in an initial growth phase under a first set of culture conditions for a first period of time sufficient to allow said cells to reproduce to a viable cell density within a range of about 20%-80% of the maximal possible viable cell density if said culture were maintained under the first set of culture conditions; changing at least one of the culture conditions, so that a second set of culture conditions is applied and a metabolic shift occurs in the culture, wherein said metabolic shift is characterised by a reduction in the ratio of a specific lactate production rate to a specific glucose consumption rate; maintaining said culture for a second period of time under the second set of conditions and for a second period of time so that the antibody accumulates in the cell culture.