Kinase, in vitro: 

An enzyme-substrate reaction that occurs in non-living experimental conditions such as a test tube. For example, a purified enzyme is reacted with a substrate protein or mixture of proteins or peptides.

Fyn Y381-p
Phosphatases, in vitro:
PTP4A1 Y381-p
Regulatory protein:
PTP1B Y381-p
PTPN13 Y381-p
PTPN2 Y381-p
SH2-B-beta Y381-p
siRNA Y381-p