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When you observe your neural stem cell culture with the phase contrast microscope, you see the following image:
Elsbernd, Joseph. Neuronal Stem Cells. Digital image. Flckr. Flckr Creative Commons, 24 May 2011. Web. 25 Feb. 2016.
Which statement best explains the small, bright, spherical structures visible in the culture?
The spherical structures are smaller than the stem cells, indicating that they are microbial contamination.
The spherical structures are cells undergoing cell division and have detached from the surface of the plate.
The spherical structures represent the undifferentiated stem cells and the larger cells with distinctive shape represent cells that have differentiated in this culture.
The spherical structures represent components of the growth media that have precipitated out of solution.