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.

[Q]:  Tubular dysfunction in renal lithiasis : cause or consequence ? ] To investigate whether overall tubular dysfunction is encountered in a particular subgroup of patients with urolithiasis , the following parameters of renal tubular function have been measured in fasting morning urine in 124 male stone formers : excretion of lysozyme and gamma - glutamyl transpeptidase ( gamma - GT ) , fractional excretion ( FE ) or glucose , insulin , bicarbonate after an alkali load , and theoretical phosphate threshold ( TmP / GFR ) .
[A]: gamma - GT


[Q]:  Searching the human DNA data base of expressed sequence tags ( EST ) revealed novel partial sequences similar to , but distinct from , the sequences of the previously known PEF proteins .
[A]: PEF proteins


[Q]:  In contrast to the p16 - mediated G1 block , G1 arrest mediated by the cdk inhibitors p21Cip1 or p27Kip1 cannot be bypassed either by inactivation of pRb or overexpression of E2F family members .
[A]:
E2F family members