my$dep_ox_sth=$self->xref->dbc->prepare("select object_xref_id from object_xref where master_xref_id = ? and ensembl_object_type = ? and ensembl_id = ? and linkage_type = 'DEPENDENT' AND ox_status = 'DUMP_OUT' and xref_id = ?");
my$insert_dep_go_sth=$self->xref->dbc->prepare("insert ignore into go_xref values(?, ?, ?)");
my$insert_ix_sth=$self->xref->dbc->prepare("insert ignore into identity_xref(object_xref_id, query_identity, target_identity) values(?, 100, 100)");
my$get_type_sth=$self->xref->dbc->prepare("SELECT ensembl_object_type FROM object_xref WHERE object_xref_id = ?");
my$get_type_sth=$self->xref->dbc->prepare("SELECT ensembl_object_type FROM object_xref WHERE xref_id = ?");