In accordance with a first aspect, a binding assay comprises a machine-readable storage medium which supports a molecular receptor (22). In accordance with a second aspect, a support member (50) supports first (22) and second (24) molecular receptors and first (26) and second (28) data identifying the molecular receptors (22,24). In accordance with a third aspect, a support member has a first annular portion (106) to support molecular receptors and a second annular portion (108) to support machine-readable data identifying the plurality of molecular receptors.