Apoptosis Article Bacterial chromophores Cell Culture Techniques Dose-Response Relationship, Radiation Flavin Mononucleotide Flavin-Adenine Dinucleotide Granadaene Light NAD Photobiomodulation Photosensitizing Agents Porphyrins Streptococcus agalactiae Time Factors apoptosis bacterial cell bacterial survival bacterium colony bacterium culture blue light cell culture technique cell death chemical composition chemistry colony forming unit controlled study coproporphyrin flavine adenine nucleotide flavine mononucleotide