Predicted to enable calcium ion binding activity and mannose binding activity. Acts upstream of or within positive regulation of release of sequestered calcium ion into cytosol. Predicted to be active in external side of plasma membrane. Orthologous to human CLEC4A (C-type lectin domain family 4 member A) and CLEC4C (C-type lectin domain family 4 member C). [provided by Alliance of Genome Resources, Apr 2022]