STRING 9.05 
C4A13 [ENSP00000396688]
Complement C4-A Precursor (Acidic complement C4)(C3 and PZP-like alpha-2-macroglobulin domain-containing protein 2) [Contains Complement C4 beta chain;Complement C4-A alpha chain;C4a anaphylatoxin;C4b-A;C4d-A;Complement C4 gamma chain]; C4 plays a central role in the activation of the classical pathway of the complement system. It is processed by activated C1 which removes from the alpha chain the C4a anaphylatoxin. The remaining alpha chain fragment C4b is the major activation product and is an essential subunit of the C3 convertase (C4b2a) and the C5 convertase (C3bC4b2a) enzymes of [...]
CST3 [ENSP00000366124]
cystatin C; As an inhibitor of cysteine proteinases, this protein is thought to serve an important physiological role as a local regulator of this enzyme activity
Evidence suggesting a functional link:
Neighborhood in the Genome:  
none / insignificant.
Gene Fusions:  
none / insignificant.
Cooccurence Across Genomes:  
none / insignificant.
none / insignificant.
Experimental/Biochemical Data:   yes (score 0.621).  
Association in Curated Databases:  
none / insignificant.
Co-Mentioned in PubMed Abstracts:   yes (score 0.149).  
Combined Score: