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Evaluation Microscope Cellular Biology Lessons: Structure & Function Chemistry Growth & Division Diversity Activities Quiz Cell Specialization, Growth, & Division As you have already learned, cells come in many shapes and sizes-even within a single organism. In our human bodies, we have approximately 200 different types of cells: brain cells, liver cells, bone cells, blood cells, and muscle cells, to name a familiar few. Each type of cell is specialized for its particular job. Cells