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. 2016 Nov 30;3(11):160775. doi: 10.1098/rsos.160775

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© 2016 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — Pectoral myosin heavy chain (MyHC) expression of white-crowned sparrows (WCS) during the winter (February) and the departure (April) and arrival (May) stages of their spring migration. Silver-stained SDS-PAGE gels (a) demonstrated that MyHC isoforms transitioned in the sparrow across the three sampling periods. Wintering specimens (February) expressed a single MyHC isoform similar to a novel isoform found in the yellow-bellied sapsucker (S.V.) flexor perforans digiti II (flex.) and pectoralis (pect.) [52]. This isoform migrated between the SM2 (a) and adult fast (c) isoforms present in the chicken (G.g.) anterior latissimus dorsi (ALD) and pectoralis (pect.), respectively. Departing (April) and arriving (May) sparrows expressed two MyHC isoforms including the novel isoform (b) and the adult fast isoform (c). No embryonic/neonatal MyHC isoforms, including the isoform present in the woodpecker flexor (d), were present in the white-crowned sparrow flight muscle. Both sparrow MyHC isoforms reacted with the EB165 (b) and F30 (c) antibodies, similar to the adult fast MyHC found in the chicken pectoralis.