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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def search_rna_quantifications(self, rna_quantification_set_id=""):
 """ Returns an iterator over the RnaQuantification objects from the server :param str rna_quantification_set_id: The ID of the :class:`ga4gh.protocol.RnaQuantificationSet` of interest. """

        request = protocol.SearchRnaQuantificationsRequest()
        request.rna_quantification_set_id = rna_quantification_set_id
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "rnaquantifications",
            protocol.SearchRnaQuantificationsResponse)