Hemoglobin subunit alpha 1 (gene symbol: hba1) is located on chromosome 16. The alpha-2 (HBA2) and alpha-1 (HBA1) coding sequences are identical. These genes differ slightly over the 5' untranslated regions and the introns, but they differ significantly over the 3' untranslated regions. Please retrieve in NCBI the full report for hemoglobin subunit alpha 1 [Homo sapiens (human)]. Please identify the intron and exon content of hba1. Group of answer choices
O 3 exons and 2 introns
O 1 exon and 1 intron
O 2 exons and 2 introns
O 2 exons and 3 introns