The centromeric version of a gene that codes for a protein whose absence results in the death of  these cel s has a C to T mutation at exon 7 as compared to the gene's telomeric version. The alpha type of these cel s form a negative feedback loop with Renshaw cel s. The telomeric version of that gene codes  for the SMN protein and is mutated in SMA. Lesions of the upper ones of these cel s can be diagnosed by  the presence of a clasp-knife response or the Babinski sign. These cel s are organized in the anterior horn of the spinal cord according to the flexor- extensor and proximal-distal rules. These cel s are clustered in columnar nuclei cal ed pools and their lower type is split into two types based on whether they interact  with extrafusal or intrafusal fibers. The most common disease that affects these cel s is ALS. For 10 points, ide
The centromeric version of a gene that codes for a protein whose absence results in the death of  these cel s has a C to T mutation at exon 7 as compared to the gene's telomeric version. The alpha type of these cel s form a negative feedback loop with Renshaw cel s. The telomeric version of that gene codes  for the SMN protein and is mutated in SMA. Lesions of the upper ones of these cel s can be diagnosed by  the presence of a clasp-knife response or the Babinski sign. These cel s are organized in the anterior horn of the spinal cord according to the flexor- extensor and proximal-distal rules. These cel s are clustered in columnar nuclei cal ed pools and their lower type is split into two types based on whether they interact  with extrafusal or intrafusal fibers. The most common disease that affects these cel s is ALS. For 10 points, identify these neurons that innervate muscles.
The centromeric version of a gene that codes for a protein whose absence results in the death of  these cel s has a C to T mutation at exon 7 as compared to the gene's telomeric version.
motor neurons [or motoneuron; or specific types of motor neurons, such as "upper", "lower",  "alpha", "gamma"; prompt on neurons, spinal neurons, extrapyramidal neurons, or cranial neurons]