First, make sure that your cells are mammalian and non-blood derived. If the cells have low transduction efficiency (i.e., only a few cells are labeling or are labeling only dimly), first try increasing the particle number per cell. The next thing to try is to use the BacMam Enhancer Solution. If, however, your cells show labeling, but the localization seems to be too generalized or ubiquitous within the cell, then you should reduce the particle number per cell. The manual gives a guideline and formula for calculating particle number per cell.
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