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:  The hyperpigmentation is linked to the presence of numerous single melanosomes and polymelanosomes in keratinocytes at all levels of the epidermis , and in dermal Factor XIIIa - positive dendrocytes .

A: Factor XIIIa
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Q:  In vitro , c - Src phosphorylated FAK Tyr - 925 in a glutathione S - transferase - FAK C - terminal domain fusion protein , whereas FAK did not .

A: c - Src
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Q:  Molecular analysis indicated that inactivation of H - 2L expression in nearly every null clone resulted from an apparent deletion or rearrangement of 5 ' - flanking and 5 ' - coding H - 2L sequences , with breakpoints consistently mapping to within a 550 bp GC - rich region between exon 1 and the middle of intron 2 .

A:
H - 2L
****