... neuraminide by SNA, and indolyl react with diazonium which develops red or purple. The degree of color is positively related to ... , blue2). SNA (the middle hole of cassette)Normal clear colorAbnormal red or purpleCaution 1. This set is only for in vitro ... , protecting from light.Biosino Bio-Technology and Science Inc.Add No.27, Chaoqian Road, Changping District,102200 Beijing, ChinaTel +86-10-69722840 ...