Hi, I download the jar file. But I have problem to include it as a library in JBuilder4. When I used "jar xvf biojava-1.00.jar" to see the classes in it, I got the following message: java.util.zip.ZipException: invalid entry size (expected 156 but got 158 bytes) at java.util.zip.ZipInputStream.readEnd(ZipInputStream.java:355) ............... Please help, Jerry