passages.id: split_8_test_1427_passage
passages.type: progene_text
passages.text: Based on the Scatchard analysis of radioligand binding studies , the following amino acids were deemed critical for ligand binding : (i) Asp9 , Glu12 , Lys108 , and Lys120 for IL-8 and (ii) Glu7 , Asp9 , and Glu12 for GROalpha .