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The authors wish to publish the following addendum to J. Cell Sci. 121, 1671-1680.Further characterization of the SPARC-null fly line Df(3R)nm136, generated by P-element mutagenesis, has revealed that the line carries a secondary mutation in the neuralized locus, in addition to an absence of SPARC. We have confirmed in a wild-type neuralized background that the absence of SPARC leads to a reduction of collagen IV in basal lamina in stage 17 mutant embryos. The absence of SPARC does not affect neural development during embryogenesis.

The authors wish to publish the following addendum to J. Cell Sci. 121, 1671-1680.Further characterization of the SPARC-null fly line Df(3R)nm136, generated by P-element mutagenesis, has revealed that the line carries a secondary mutation in the neuralized locus, in addition to an absence of SPARC. We have confirmed in a wild-type neuralized background that the absence of SPARC leads to a reduction of collagen IV in basal lamina in stage 17 mutant embryos. The absence of SPARC does not affect neural development during embryogenesis.

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