gistfile1.txt

  (->> human
       sequence-headers
       first
       ((juxt :n-block-starts :n-block-sizes))
       (apply interleave)
       (partition 2)
       (map vec)
       clojure.pprint/pprint)

;; Gives:

([0 10000]
 [177417 50000]
 [267719 50000]
 [471368 50000]
 [2634220 50000]
 [3845268 150000]
 [13052998 50000]
 [13219912 100000]
 [13557162 50000]
 [17125658 50000]
 [29878082 150000]
 [103863906 50000]
 [120697156 50000]
 [120936695 150000]
 [121485434 21050000]
 [142731022 50000]
 [142967761 150000]
 [143292816 50000]
 [143544525 100000]
 [143771002 100000]
 [144095783 50000]
 [144224481 50000]
 [144401744 50000]
 [144622413 50000]
 [144710724 100000]
 [145833118 50000]
 [146164650 50000]
 [146253299 50000]
 [148026038 150000]
 [148361358 150000]
 [148684147 50000]
 [148954460 50000]
 [149459645 50000]
 [205922707 150000]
 [206332221 150000]
 [223747846 50000]
 [235192211 50000]
 [248908210 150000]
 [249240621 10000])