rm1131ab316223 is the carrier-free version of ab316222. Our carrier-free antibodies are typically supplied in a PBS-only formulation, purified and free of BSA, sodium azide and glycerol. The carrierHyperlinks: Searchable Attributes. 2 records found for 'RM1131-AP'. Search for. IP address lookups, Miscellaneous queries. -l. 1st level less specific.