passages.id: BioInfer.d687.s1__text
passages.type: Sentence
passages.text: To test for regional differences in the rates of synthesis and degradation of contractile proteins during normal physiological growth of the heart in vivo, fractional rates of protein accumulation and synthesis were assessed for total protein, myosin heavy chain, myosin light chain, phosphorylatable myosin light chain, and actin in the right and left ventricular free walls of growing, New Zealand White rabbits.