tokens: SDS-PAGE analysis of the receptor protein has shown a molecular weight of approximately 50 kD .
folded_tokens: sds-page analysis of the receptor protein has shown a molecular weight of approximately 50 kd .
labels: B-other_name I-other_name O O B-protein_family_or_group I-protein_family_or_group O O O B-other_name I-other_name O O B-other_name I-other_name O