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  1. Bracken rhizome, light micrograph
  2. Scanning electron micrograph of HIV particles infecting a human T cell
  3. Conceptual image of DNA
  4. Buttercup stem, light micrograph
  5. Microscopic view of human antibodies with red blood cells
  6. Pond life
  7. Nerve demyelination, TEM
  8. Conceptual image of platelets with red blood cells
  9. Cell
  10. Muybridge Motion Study, 1870s
  11. Plant cell
  12. C-reactive protein, molecular models
  13. Confused Flour Beetle Adult, SEM
  14. Embryo development 24-36 hours after fertilization
  15. Paramecium protozoa, light micrograph
  16. Cell
  17. Microscopic view of a leukemia cell
  18. Male Hercules Beetle
  19. Common Dolphins
  20. Human blood cells, SEM
  21. Liver proteins
  22. Platelet activation, artwork
  23. Common House Mosquito, SEM
  24. Conceptual image of platelet, red blood cell and white blood cell
  25. Cell
  26. Thyroid cancer cells
  27. Cell
  28. Cell
  29. Escher's Blue Butterfly
  30. Scanning electron micrograph of just-divided HeLa cells
  31. Metabolic enzyme, artwork
  32. Chrysanthemum flower bud light micrograph
  33. Scanning electron micrograph of an apoptotic HeLa cell
  34. Cells
  35. Conceptual image of DNA
  36. Cell
  37. Spirogyra algae, light micrograph
  38. Section through a pine needle, LM
  39. Fluid aspirate from staph infection
  40. Conceptual image of DNA
  41. Axon anatomy, diagram
  42. Conceptual image of chromosome
  43. Antibiotic destroying a bacterium
  44. Conceptual image of DNA
  45. Conceptual image of human lungs and rib cage
  46. Microscopic view of blood clotting inside the artery
  47. Conceptual image of DNA
  48. Microscopic view of plant tissues