AIP and cervical squamous intraepithelial neoplasia: The results with CIN+AIP indicate that the PAL inhibitor did not prevent either the influx of the allelochemical into the metabolic pathway or the formation of H. In agreement with the results obtained with cinnamic acid alone, the sum of H+G+S (Table 2) increased and the H∶G∶S ratio (34∶54∶12) was altered (especially with respect to the H form) compared with the control ratio (14∶72∶14).