A novel regulator of the alternative complement pathway with functions simi
lar to that of factor H has been identified in human plasma. The cDNA encod
ing this factor H-like protein 1(FHL-1/reconectin) was isolated several yea
rs ago. Here, Peter Zipfel and Christine Skerka describe functional analyse
s revealing that this novel complement regulatory protein forms a molecular
link between immune defense and cell adhesion.