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]: An analysis of skeletal development in osteoblast- and chondrocyte-specific Runx2 knockout mice.
[A]: Runx2


[Q]: Synthesis of derivatives of methyl rosmarinate and their inhibitory activities against matrix metalloproteinase-1 (MMP-1).
[A]: matrix metalloproteinase-1


[Q]: The structures of thymidine kinase from herpes simplex virus type 1 in complex with substrates and a substrate analogue.
[A]:
thymidine kinase