“…At 24 h after PDT irradiation, the level E P-NTP/Pi ratios remained significantly reduced compared to all pre-treatment control levels. Inter- (Figure 6), followed by a gradual return to near pretreatment levels by [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] h, a finding which is in agreement with other investigators (Naruse et al, 1986b;Chopp et al, 1987Chopp et al, , 1990 (Ceckler et al, 1986;Hilf et al, 1987 (Gibson et al, 1990).…”