Are the black boxes supposed to indicate exons? If so is the furthest black box at the start of the gene the promoter region?
This is the - strand so the gene is read right to left.
Yes, the boxes are exons. The less wide part in the beginning should be the 5' UTR. And at the end of the gene that's the 3' UTR.
Confirm, boxes indicate only the transcibed part of the gene: black boxes are thus exons, with thicker parts representing CDS and thinner parts represent the UTR regions, not the promoter. If gene is to be read from left to right, the 3rd exon is different in the 2 isoforms
If the gene is on the minus strand then the thinner bar to the right is the 5'-UTR, the thicker bar is the protein-coding exon, which should start with ATG, and very thin lines are introns.
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