Fig. 2From: Clopidogrel treatment may associate with worsening of endothelial function and development of new digital ulcers in patients with systemic sclerosis: results from an open label, proof of concept studyEffect of clopidogrel on serotonin and sVCAM1 levels. No change in serotonin levels in platelets poor plasma was found in patients with SSc following 14Â days of treatment with clopidogrel (a). sVCAM1 levels are significantly increased following clopidogrel treatment in patients with SSc (b)Back to article page