How many copies per particle are created by the enterotoxin?
{'header': ['RNA Segment (Gene)', 'Size ( s base pair )', 'Protein', 'Molecular weight kDa', 'Location', 'Copies per particle', 'Function'], 'page_title': 'Rotavirus', 'page_id': '', 'types': ['real', 'real', 'text', 'text', 'text', 'text', 'text'], 'id': '1-140968-1', 'section_title': 'Nonstructural viral proteins', 'caption': 'Rotavirus genes and proteins', 'rows': [['1', '3302', 'VP1', '125', 'At the vertices of the core', '<25', 'RNA-dependent RNA polymerase'], ['2', '2690', 'VP2', '102', 'Forms inner shell of the core', '120', 'Stimulates viral RNA replicase'], ['3', '2591', 'VP3', '88', 'At the vertices of the core', '<25', 'Guanylyl transferase mRNA capping enzyme'], ['4', '2362', 'VP4', '87', 'Surface spike', '120', 'Cell attachment, virulence'], ['5', '1611', 'NSP1', '59', 'Nonstructural', '0', "5'RNA binding"], ['6', '1356', 'VP6', '45', 'Inner Capsid', '780', 'Structural and species-specific antigen'], ['8', '1059', 'NSP2', '35', 'Nonstructural', '0', 'NTPase involved in RNA packaging'], ['9', '1062', 'VP7 1 VP7 2', '38 and 34', 'Surface', '780', 'Structural and neutralisation antigen'], ['10', '751', 'NSP4', '20', 'Nonstructural', '0', 'Enterotoxin']], 'name': 'table_140968_1'}