I began by downloading raw nucleotide data from Ensembl Human at the Sanger Institute [NLGN4-Y here], one of several genome browsers available for researchers. This site displays the data with introns (non-coding segments) removed and with the exon divisions highlighted.
This is what the raw data looks like (exons alternate blue and black):
GAGACGAAGCAGGGAGAGAGTGAACTTCAGCCCCGTCCCCTCCCCACTGCCACGGCTGGG
GCAACCCAACCCGCGCCTGAAGCGGCTTGGCTTGACCTGCGGAAGCGCGGGCCGGGATGG
CGTGGGGAGAGGGAGGTAGGTGCCACTGGGCTGCAGATGACGAGTGGGTTGGGGGCTTGC
TGTGGGACAAGAGGTTCAGGTTCCGGCCTGCGCCTTCCACTCCGCGGTGGCGCTCTCTGC
CTGCGGTTTTCCAGGAGGCCGATCTACCCCAGGGACACTCTCATCCTTCAGGCGGTCTCC
TGGACGCCCTTTCCTCCCCTTGCCTCCCAGCCTGACCTGGCTCTTTCGCCCCTCGGAGAA
CCGGTTGCATTGGAGTTTTCGAAAGACTTATCTTTCTGCAGGCTCGCCTCTGAGCTTTGT
CTCCTTGGAGCCACCTCACTTAGACAGCTTCGGATGTGGATGCAGATTTGAACCATGTTG
CGTCCCCAGGGACTGCTATGGCTCCCTTTGTTGTTCACCTCTGTCTGTGTCATGTTAAAC
TCCAATGTTCTTCTGTGGATAACTGCTCTTGCCATCAAGTTCACCCTCATTGACAGCCAA
GCACAGTATCCAGTTGTCAACACAAATTATGGTAAAATCCAGGGCCTAAGAACACCATTA
CCCAGTGAGATCTTGGGTCCAGTGGAGCAGTACTTAGGGGTCCCCTATGCCTCACCCCCA
ACTGGAGAGAGGCGGTTTCAGCCACCAGAATCCCCATCCTCCTGGACTGGCATCCGAAAT
GCTACTCAGTTTTCTGCTGTGTGCCCCCAGCACCTGGATGAAAGATTCTTATTGCATGAC
ATGCTGCCCATCTGGTTTACCACCAGTTTGGATACTTTGATGACCTATGTTCAAGATCAA
AATGAAGACTGCCTTTACTTAAACATCTATGTGCCCATGGAAGATGATATTCATGAACAG
AACAGTAAGAAGCCTGTTATGGTCTATATCCATGGGGGATCTTACATGGAGGGAACCGGT
AACATGATTGATGGCAGCATTTTGGCCAGCTATGGGAACGTCATCGTTATCACCATTAAC
TACCGTCTGGGAATACTAGGGTTTTTAAGTACCGGTGACCAGGCAGCAAAAGGCAACTAT
GGGCTCCTGGATCAGATTCAAGCACTGAGGTGGATTGAGGAGAATGTCGGAGCCTTTGGC
GGGGACCCCAAGAGAGTGACTATCTTTGGCTCGGGGGCTGGGGCCTCCTGTGTCAGCCTG
TTGACCCTGTCCCACTACTCAGAAGGTCTCTTCCAGAAGGCCATCATTCAGAGCGGCACT
GCCCTGTCCAGCTGGGCAGTGAACTACCAGCCGGCCAAGTACACTCGGATATTGGCAGAC
AAGGTCGGCTGCAACATGCTGGACACCACGGACATGGTAGAATGTCTGAAGAACAAGAAC
TACAAGGAGCTCATCCAGCAGACCATCACCCCGGCCACCTACCACATAGCCTTTGGGCCG
GTGATCGACGGCGACGTCATCCCAGACGACCCCCAGATCCTGATGGAGCAAGGCGAGTTC
CTCAACTACGACATCATGCTGGGCGTCAACCAAGGGGAAGGCCTGAAGTTCGTGGACGGC
ATCGTGGATAACGAGGACGGTGTGACGCCCAACGACTTTGACTTCTCCGTGTCCAACTTC
GTGGACAACCTTTACGGCTACCCTGAAGGGAAAGACACTTTGCGGGAGACTATCAAGTTC
ATGTACACAGACTGGGCCGATAAGGAAAACCCGGAGACGCGGCGGAAAACCCTGGTGGCT
CTCTTTACTGACCATCAGTGGGTGGCCCCCGCCGTGGCCACCGCCGACCTGCACGCGCAG
TACGGCTCCCCCACCTACTTCTATGCCTTCTATCATCACTGCCAAAGCGAAATGAAGCCC
AGCTGGGCAGATTCGGCCCATGGCGATGAAGTCCCCTATGTCTTCGGCATCCCCATGATC
GGTCCCACAGAGCTCTTCAGTTGTAATTTCTCCAAGAACGACGTCATGCTCAGTGCCGTG
GTGATGACCTACTGGACGAACTTCGCCAAAACTGGTGATCCAAACCAACCAGTTCCTCAG
GATACCAAGTTCATTCATACAAAACCCAATCGCTTTGAAGAAGTGGCCTGGTCCAAGTAT
AATCCCAAAGACCAGCTCTATCTGCATATTGGCTTGAAACCCAGAGTGAGAGATCACTAC
CGGGCAACGAAAGTGGCTTTCTGGTTGGAATTGGTTCCTCATTTGCACAACTTGAACGAG
ATATTCCAGTATGTTTCAACAACCACAAAGGTTCCTCCACCAGACATGACATCATTTCCC
TATGGCACCCGGCGATCTCCCGCCAAGATATGGCCAACCACCAAACGCCCAGCAATCACT
CCTGCCAACAATCCCAAACACTCTAAGGACCCTCACAAAACAGGGCCCGAGGACACAACT
GTCCTCATTGAAACCAAACGAGATTATTCCACCGAATTAAGTGTCACCATTGCCGTCGGG
GCGTCGCTCCTCTTCCTCAACATCTTAGCCTTTGCGGCGCTGTACTACAAAAAGGACAAG
AGGCGCCATGAGACTCACAGGCACCCCAGTCCCCAGAGAAACACCACAAATGATATCACT
CACATCCAGAACGAAGAGATCATGTCTCTGCAGATGAAGCAGCTGGAACACGATCACGAG
TGTGAGTCGCTGCAGGCACACGACACGCTGAGGCTCACCTGCCCTCCAGACTACACCCTC
ACGCTGCGCCGGTCGCCGGATGACATCCCATTTATGACGCCAAACACCATCACCATGATT
CCAAACACATTGATGGGGATGCAGCCTTTACACACTTTTAAAACCTTCAGTGGAGGACAA
AACAGTACAAATTTACCCCACGGACATTCCACCACTAGAGTATAGCTTTTCCCTATTTCC
CCTCCTATCCCTCTGCCCCTACTGCTCAGCAATGTAAAAGAGACAAATAAGGAGAAAGAA
AATCTCCAAACCAGGAATGTTTTTGTGCCACTGACTTTAGATAAAAATGCAAAAGGGCAG
TCATCCTGTCCCAGCAGACCCTTCTCATTGGCATTTTCCAGTATTGTGAGATCAATTTCT
GACCATATGAAATGTGAAAAGTATATGTTTCTGTTACAATACTGCTTTAAGATCTAAACC
ATGCCAACAGATGTTTCGTGTGACTAGGACATCACCATTTCAAGGAACTGTGTGTTTCCA
ACATCATGGTAGCAGCACACACTTCCAAAGCTCAGCCAGGGACACTTAATATTTTTTAAT
TACAATGGAAATTTAAACATTTTTATGTGGGCTACACAATGGATGGCTCTTCTTAAGTGA
AGAAAGACTCTATAGGCTTTTACACAGCACATGAAGCAGTAATCCAGAAAGAAGGAAATG
CAGAATTTTATTATCAAAGTAAGCGAATTGACTGTGCAGAAAAATTGTAGGGTTCTGTGG
AAGGAGGTATTCTGCCAGCCTGAACTATATTTAAGAAACTTTGTAAAAAATAAAAATGTA
TATAGCTGTGAGCTCAAACAAAAACTGCAGACAAACAAAAAAGAGAAAAGCTTTTATTTG
TGTTTTCAGTTTGAAAGAACTTTTAGCAAGGTTGTGCTTTCAAACACATATTAGTCCTAC
CACCTTAGTTCCTCTACAGCAAAAGAGGCTTTTCTTCTTAATTACATGTAAACAAAGACA
TGGGATTTTCTGACGTAAGATTTTCATTTGTAGGAATATGTGATGTCAAATGGAAGACTC
AGAAGTTTTGTGTGGCCTATTTCTCCCTGTCAGGTTGCACAGATGCATGTAGAGCATTCT
TAGGAGACCATTGTTTTAGAAAACTTTGATTTGTACATGTTAGTTTTCATGAAATTGCAA
CACAGAGATAGGTCCTAAAAGTGGAATGTATTTAAAACTTGTTGAATTAGACACACACAC
ACAGACACACACAAAGAATCAGCAGAGAAAACAAAATACAAGTCCTGTTCTGTAGTTCTT
GCCCTTTGAATATATTTGGGAAGAGTTGCTTCCTATTTCAGGACCCTGCCAAAAAAGAAG
AAAGCTTGCCTTTGGTGGGGCTATGCCCCTTGGAGTAAATACAGCTCTGTGTTCCCTAGC
AGCTGCCGGAGGATTTGGCTGATGAAGTACCTGCTCAGCTTAGCTAATCAGATTAAAGGA
AGACATGTATGTCTTTTGTTTAAGCACCTAGTCCCTTATGTATCAGTAAACAGGTTTTTA
AAAATCTTTTATGTCATTTATAGGATAAAACATATGCTTGTCTGAAAATATCACCTTTTG
TGGATTTATCTGATCACCAAATAATAAATATTAAGAAGAATGGGGGAAAAAGGATAGAAT
ATTAAAACTGCTTTGCATAGGTTTTTGGGGAAATTAGGATATCTTCACTGACAAGACACT
GAATGGAATTTATTCACCCATTTTAAATTGGTTACTTGGGGATCAGAGATTTGTCTCTCC
AACAGCTTGTGGTTTTCTTATTACTCATTTTCAGGAAAGTTTGTAGTATTACAAGGCAGA
AGGAAACACAGTAGCAATGGTTGCTCTATATTTTGTCTTTCAAAGATTACTGCATTACCA
AGAAACAGTAGCCAAAGATGTTTGAAGATCATGTCCCTTAGCTGCATTGTGGGTTATTCT
AGAAATCCAATGTTAAATGCCTCTACTAAAGTGGGGATTCCCCATAAAAATTGTCCAGCT
ACCTGACTCTTTTGCAATAACAACTTTGATTACTGAATCCATACACTCAAACTATAGTGA
TATATCAGTGTTTGGGAGTGACCTCTAGAAAAAAGAAAACTGTTTTTAGAAATACATAAA
ATCACTTCCAAATCCTGTTGCTTATGTTGGGTTAAATTTGAAAGCAATTCTCTATATATA
AATATGTGAAATATTATGATCTGAACTTAGCACACATGAAGCAACATTTCTTTGCTACAC
AGAGGTGTCTTGGAAAGATTTCATTCCCAATTCATTTTTCATAGATCTATAATCAGGCAA
TTTCTGCAAGCAATGTATGACCCCACCTGAGCAACCACAAATAGGCTCTCCATGAAACTG
CAAAGGAACTGATGTGTGGCATCCATGCTGGTTTTGTCTGTCTATAATATGAATTCAAGT
ATCTGTTCATATTTCCAATTGTCTCCTGCTAGCAATATGTGCCACAACATGACAGTCTTG
TGACATCTTAAGGAAAAGAAGAGTTCCTGTTAAATGAATAGCTTTAGCTTTTACAGGGGA
TTATGATTAAAAGTGATTTAGTACATCTT