A cDNA clone representing the complete sequence CsTegu20.6 was isolated using the C. sinensis adult cDNA library . Sequence analysis of CsTegu20.6 indicated an open reading frame (ORF) of 528 nucleotides, and the deduced amino acid (aa) sequence revealed a protein of 175 residues with a calculated molecular mass of 20.57 kDa and a theoretical isoelectric point (pI) of 6.15. This protein was predicted to be localized in the cytoplasm and did not contain any signal peptides or transmembrane domains. A functional domain search indicated the presence of an EF-hand domain (PS00018) at aa46–58 and a dynein light chain domain (DLC) (PF01221) at the C-terminus (aa97–173) (Figure S1). This is in broad accordance with earlier work in which tegumental proteins were analyzed using bioinformatics tools and shown to be composed of one or two EF-hand domains and a DLC domain at the N- and C-termini, respectively .