Recombinant human CD235a (also known as GYPA, glycophorin A), encompassing amino acids 20-91. The protein is fused at the C-terminus with the Fc fragment of a human IgG1 followed by a C-terminal Avi-Tag™. The recombinant protein was affinity purified. HiP™ indicates a high purity protein (≥90% pure) and less than 10% aggregation as measured by gel filtration.