Skip to main content
. 2020 Jun 8;10(6):383. doi: 10.3390/diagnostics10060383

Figure 2.

Figure 2

The principle of photodynamic diagnosis (PDD) of 5-ALA mediated protoporphyrin IX (PpIX) in tumour cells (a); molecular structure of PpIX and fluorescence spectrum (b), following excitation with violet blue light at 405 nm, PpIX emits a red fluorescence of 635 nm.