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1000 gracias. excellent - I was considering commingle - out of desperation, but your reference is exactly to the point and very similar to text I am translating 4 KudoZ points were awarded for this answer
These links use "interdigitar" in relation to muscle fibers:
VI. APARATOS DE PRECISIÓN: MOTILIDAD COORDINADA - [ Translate this page ]
... sarcómeros; C) el sarcómero esta formado por filamentos de actina (delgados) y
miosina (gruesos), que se interdigitan. Los extremos de los filamentos de la ...
omega.ilce.edu.mx:3000/sites/ciencia/volumen3/ciencia3/143/ htm/sec_10.htm - 40k - Cached - Similar pages
The sarcomere consists of thick myosin filaments, thin actin filaments, and two regulatory proteins, troponin and tropomyosin. It is bound on either side to a plate, Z line, to which actin filaments are attached. Alpha-actinin is a protein that binds actin fibers to the Z lines. The overlapping actin and myosin form the dark A (anisotropic) band in the middle of the sarcomere. The light I (isotropic) band is only made of actin.