Cell culture puzzle

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Across
  1. 3. Greatest fear of anyone culturing cells
  2. 5. Cryoprotective agent
  3. 7. Blood-derived component added to growth medium to support cell culture
  4. 8. Needs to be 5%
  5. 9. Programmed cell death
  6. 10. Cells spend majority of the time here
  7. 11. Prevents growth of bacteria in cell culture
  8. 12. Small and common contaminant in cell cultures, difficult to detect
  9. 15. Measure of the proportion of live, healthy cells in a culture
  10. 17. pH indicator for culture media
  11. 18. Equipment used to separate cells or cell components by spinning at high speeds
  12. 19. Tool to assess confluency
  13. 20. Agent CE&S uses to wash residual medium of cells
  14. 21. Method of introducing foreign DNA into cells
Down
  1. 1. Term describing the proportion of the surface area covered by cells
  2. 2. Equipment used to provide a contaminant-free work environment
  3. 4. Enzyme to detach cells
  4. 6. Study of the form and structure of cells
  5. 13. Type of culture where cells grow freely in the medium
  6. 14. Type of cells that need to attach to a surface to grow.
  7. 16. Single layer of cells grown on a culture dish