PIE blood

which is the PIE radical for blood?
I wonder because in rom. sînge= blood is supposed to comme
from latin "sanguine".
There is a small tree, "sînger" in romania=cornus sanguinea ,
which in DEX is supposed to be a simple degresive derivation
of "sînge"
But unfortunately I see a dacian toponim which is called
"Singidava". so.... so i get again problems in my way:-)

Any ideeas?