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(a)

(b)

Figure 3: Growth curves of the stably transfected Sf9 producing hIL-7 and nontransfected Sf9 insect cells. (a) Viable cell density, total cell density, and viability of stably transfected Sf9 with pIE1/153A (V4)/hIL-7 plasmid. Cells were seeded at a density of $5\times {10}^5$ cells·mL−1 and maintained at $1\times {10}^7$ cells·mL−1. (b) Viable cell density, total cell density, and viability of nontransfected Sf9 insect cells. Cells were seeded at a density of $5\times {10}^5$ cells·mL−1 ($n=3$).