11. Netrins also act as growth factors, encouraging cell growth activities in target cells . 12. This creates a stronger bonding interaction between the bacteria and the target cell . 13. Cancer treatment by chemotherapy and irradiation kills target cells primarily by inducing apoptosis. 14. The new stem cells would be removed and then grown into the target cells . 15. Daidzein transactivates all three PPAR isoforms, ?, ?, and ? and influences target cells . 16. The Schaffer collateral clearly affects whether the target cells fire action potentials or not. 17. Some of the trans-genes hit their target and become part of the target cells . 18. The drug inhibits viral entry into target cells and also stimulates the immune response. 19. This means that there is very little non-target cell loss. 20. But to reach particular target cells , axons follow chemical cues strewn along their path.