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Immunodetection of serotonin expression at higher cell passages (P-STS P49, L-STS P42 and H-STS P41). The KRJ neuroendocrine tumor cell line was used as positive control (data not shown). Preadsorption (pa) with serotonin creatinine sulphate complex (pa P-STS, pa L-STS, pa H-STS) was done to obviate unspecific binding.
