Watson Crick is a mid-calf sock with a graphic representation of DNA.

The socks have a mirrored pattern of spiralling cables with garter
stripes. The leg has the cable and stripe pattern on the front and
back, the foot has the stitch pattern only on the top with a stockinette sole. They are worked from the top down with a
traditional slipped stitch heel flap, heel turn and a wedge toe.
The sock begins with a 2 by 2 rib in a twenty row cuff. The spiral
cable pattern is worked once front and back for the leg. The heel
flap is then worked in slip stitch and the heel turned. Stitches are
picked up down the sides of the heel flap and the sock is worked in the Rnd again, continuing the stitch pattern on the top of the sock only and decreasing the gusset stitches. The sock ends with a wedge toe.

Yarn
Cascade Heritage, Limestone 5681 (75% Wool,
25% Nylon); 437 yds 400 m/100 g
Needle/Hook
Size US 1 (2.25mm) DPNs or 9” (23cm) circulars
Or size needed to obtain gauge
Gauge
34 sts and 44 rows = 4” 10cm in St st
34 sts and 44 rows = 4” 10cm in chart patt after
blocking
Size
Leg, 7 (7.25, 7.75, 8, 8.25)” 17 (18, 19, 20, 21)
cm long and XS (S, M, L, XL): 6.57 (7.5, 8.0, 8.5)”
16 (18, 19, 20, 21cm circumference. Foot length
adjustable.

There is a second file that contains all the charts and full written instructions for those charts. Each sock in each size has its own chart and separate written instructions for the leg and foot for ease of use.