pH sensitive fluorophore

[aagst8+ at pitt.edu]

Hi!

  I'm looking for a pH sensitive fluorophore that increases its'
fluoresence in the presence of H+ ions.  The probe would need to 
accumulate in acidic compartments much like acridine orange, which 
unfortunately quenches w/ low pH.

  I would appreciate any help.

Thanks,

Aaron Gerlach
aagst8+ at pitt.edu