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. 1998 Jan 12;140(1):233–245. doi: 10.1083/jcb.140.1.233

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Immunostaining of MMP-9 and MMP-13. MMP-9 (a and b) and MMP-13 (c and d) immunoreactivity were absent in uninjured wild-type arteries (a and c), but were markedly upregulated throughout the entire vessel wall after injury (b and d). The arrows indicate the internal elastic lamina whereas the arrowheads indicate the external elastic lamina.