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Westermark B, Siegbahn A, Heldin CH, Claesson-Welsh L.Westermark B, et al.Proc Natl Acad Sci U S A. 1990 Jan;87(1):128-32. doi: 10.1073/pnas.87.1.128.Proc Natl Acad Sci U S A. 1990.PMID: 2153283Free PMC article.
Claesson-Welsh L, Eriksson A, Westermark B, Heldin CH.Claesson-Welsh L, et al. Among authors: westermark b.Proc Natl Acad Sci U S A. 1989 Jul;86(13):4917-21. doi: 10.1073/pnas.86.13.4917.Proc Natl Acad Sci U S A. 1989.PMID: 2544881Free PMC article.