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Regional variants of German Sign Language include Hamburg, Berlin, and Munich sign. Sign languages of regions in the former East Germany have a greater divergence from sign languages of the western regions; some may be unrelated. Polish Sign Language is descended from German Sign Language. Israeli Sign Language may be as well, as it evolved from the sign language used by German Jewish teachers who opened a school for deaf children in Jerusalem in 1932, and still shows some resemblance to its German counterpart. It is not related to Austrian Sign Language, which is used in parts of southern Germany, nor to Swiss Sign Language, both of which are part of the French Sign Language family, though they have had some influence from German Sign Language.