text: UVA radiation, yo, it's in the zone
  Midday sun, 95 percent, it's known
  Deeper penetration, it's got the power
  Through the skin, deeper than UVB, wow!
  
  UVA's absorbed by chromophores within
  Reactive oxygen species, let the game begin
  Singlet oxygen, that's (1)O(2)
  A biochemical intermediate, it's true
  
  Multiple processes, it's involved in that
  Understanding its generation, where it's at
  Direct detection, luminescence shines
  Helps us see (1)O(2) in different times
  
  In solutions, in vitro, in vivo too
  Endogenous photosensitizers, they do
  Generating (1)O(2) under UVA's rays
  Visualize its action, in amazing ways