In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 The Valpha and Vbeta domains have the canonical features of known teleost and mammalian TCR V domains , including conserved residues in the beginning of FR2 and at the end of FR3 .
Vbeta domains

 Of 3841 serum samples from sows received from the Tennessee State Diagnostic Laboratory in 1991 - 1992 , 1130 were positive for Toxoplasma gondii antibody .
Toxoplasma gondii antibody

 Mammalian homologues of the Polycomb - group gene Enhancer of zeste mediate gene silencing in Drosophila heterochromatin and at S . cerevisiae telomeres .

Enhancer of zeste