Table: amphibian_proteins
Columns: common_name
protein_name
divergence_from_human_lineage_mya
accession_number
sequence_length_aa
sequence_identity_to_human_protein

Question: What is the accession number of the protein with the common name Purple Sea Urchin?
SQL: SELECT "accession_number" FROM amphibian_proteins WHERE "common_name" = 'purple sea urchin'

Question: What is the protein name of the protein with a sequence identity to human protein of 32%?
SQL: SELECT "protein_name" FROM amphibian_proteins WHERE "sequence_identity_to_human_protein" = '32%'

Question: What is the sequence length (aa) of the protein with the common name Purple Sea Urchin and a divergence from human lineage less than 742.9?
SQL: SELECT SUM("sequence_length_aa") FROM amphibian_proteins WHERE "common_name" = 'purple sea urchin' AND "divergence_from_human_lineage_mya" < 742.9

Question: What is the accession number of the protein with a divergence from human lineage of 937.5?
SQL: SELECT "accession_number" FROM amphibian_proteins WHERE "divergence_from_human_lineage_mya" = 937.5