Friabilin component pinA is absent in Falcon hard wheat variety but present in the soft wheat varieties Chinese Spring (CS), Heron, and the disomic substitution line of Langdon durum containing the 5D chromosome of Chinese Spring [LGD-CSDS5D(5B), abbreviated L5D(5B)] and the serine-type hard wheat disomic substitution line of Chinese Spring containing the 5D of Cheyenne, a hard wheat [CS-CNN DS5D, abbreviated CS (CNN5D)]. Langdon (LGD, abbreviated L) durum has neither pinA nor pinB. Photo of silver-stained SDS/PAGE gel of 14- to 16-kDa region showing Triton X-114-isolated starch surface proteins. Arrows indicate position of friabilin component proteins pinA and pinB (A and B, respectively).