Response to Blood Pressure in Mutant Rats Lacking the 5-Hydroxytryptamine Transporter

We are pleased to become aware of research by Homberg et al,1 who investigated whether 5-hydroxytryptamine (5-HT) transporter (SERT) plays a role in regulating blood pressure in female SERT knockout rats. We agree with their interpretation that the absence of SERT does not exacerbate or reduce the ability of ωN-nitro-l-arginine (l-NNA) to elevate blood pressure increase …