alternative pathway

of complement activation
https://doi.org/10.1351/goldbook.12866
Activation pathway involving complement components C3, Factor B, Factor D, and properdin that, in the presence of a stabilizing activator surface such as microbial polysaccharide, generates the alternative pathway C3 convertase C3bBb.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1121 [Terms] [Paper]