This definition appears rarely
See other definitions of C2
Samples in periodicals archive:
Cole FS, Whitehead AS, Auerbach HS, Lint T, Zeitz HJ, Kilbridge P, Colten HR (Jul 1985). "The molecular basis for genetic deficiency of the second component of human complement". The New England Journal of Medicine 313 (1): 11–6. doi:10. 1056/NEJM198507043130103. PMID 2582254.