The Exporter variables @EXPORT and @EXPORT_OK and your exportable $EcoRI should be package globals, so declare them with our or use vars rather than my. You also need a package MySequence; declaration at the top to set up the namespace. [ I missed the initial package declaration before code tags were added. Why do you give the package a different name than the file? That my cause confusion.]

There may be more, but that's what I catch at first reading. Code tags would make it easier to scan.

After Compline,
Zaxo

In reply to Re: how to create Modules by Zaxo
in thread how to create Modules by dwijew

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