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) What does the presence of stem cells in tissues mean for those tissues if they were to be injured?

) What does the presence of stem cells in tissues mean for those tissues if they were to be injured?  What physical differences would the stem cells (any) have when compared to the differentiated tissue cells?  

  

5) Your skin's response to increased exposure to ultraviolet light is to darken prior to burning. `What is the cell and cell location of the pigment used to darken the skin and what is the sensory cell for an increase in heat found in the skin? Describe the spinal reflex for this type of pain. Please include probable neurotransmitters.

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