( ( Along ( ( the length ) ( of ( a ( muscle cell ) ) ) ) ) ( , ( ( parallel ( actin microfilaments ) ) ( are ( interdigitated ( with ( ( thicker filaments ) ( made ( of ( ( ( the ( protein myosin ) ) , ) ( a motor ) ) ) ) ) ) ) ) ) ) )
(ROOT (S (PP (IN Along) (NP (NP (DT the) (NN length)) (PP (IN of) (NP (DT a) (NN muscle) (NN cell))))) (, ,) (NP (JJ parallel) (NN actin) (NNS microfilaments)) (VP (VBP are) (VP (VBN interdigitated) (PP (IN with) (NP (NP (JJR thicker) (NNS filaments)) (VP (VBN made) (PP (IN of) (NP (NP (DT the) (NN protein) (NN myosin)) (, ,) (NP (DT a) (NN motor)))))))))))
Along the length of a muscle cell, parallel actin microfilaments are interdigitated with thicker filaments made of the protein myosin ,  a motor
(ROOT (S (NP (NP (JJ Muscle) (NN type)) (PP (IN of) (NP (NN cell) (NN function)))) (VP (VBZ relies) (PP (IN on) (NP (NP (NNS microfilaments)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (DT the) (NN actin) (NNS components)) (PP (IN of) (NP (DT the) (NN cytoskeleton)))))))))) (. .)))
Muscle type of cell function relies on microfilaments, which are the actin components of the cytoskeleton.