Given the task definition, example input & output, solve the new input case.
Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
Example: Abstract: Some patients converted from ventricular fibrillation to organized rhythms by defibrillation - trained ambulance technicians(EMT - Ds) will refibrillate before hospital arrival.The authors analyzed 271 cases of ventricular fibrillation managed by EMT - Ds working without paramedic back - up.Of 111 patients initially converted to organized rhythms, 19(17 % ) refibrillated, 11(58 % ) of whom were reconverted to perfusing rhythms, including nine of 11(82 % ) who had spontaneous pulses prior to refibrillation.Among patients initially converted to organized rhythms, hospital admission rates were lower for patients who refibrillated than for patients who did not(53 % versus 76 % , P = NS), although discharge rates were virtually identical(37 % and 35 % , respectively).Scene - to - hospital transport times were not predictively associated with either the frequency of refibrillation or patient outcome.Defibrillation - trained EMTs can effectively manage refibrillation with additional shocks and are not at a significant disadvantage when paramedic back - up is not available.
Output: Ventricular Fibrillation
This term is directly present in the abstract and it is one of the main topic in it. So can be chosen as the medical subject heading.

New input case for you: Abstract: We have characterized binding and several actions of the somatomedins [insulin-like growth factors I and II (IGF-I and IGF-II)] on L6 myoblasts. Both IGF-I and IGF-II are potent stimulators of amino acid uptake, cell proliferation, and differentiation; they also suppress protein degradation in these cells. In all measurements, the relative potencies are IGF-I greater than IGF-II greater than insulin. Two recombinant DNA-produced analogs of IGF-I, (Thr59)IGF-I and (N-Met)IGF-I, were as active as native IGF-I in all four assays. However, when 125I-labeled hormones were used for studies of binding to IGF receptors, there was a striking difference between the native and recombinant IGF-I molecules. Both were bound significantly by the type I receptor (a 350K molecule that is dissociated upon sulfhydryl reduction), but the recombinant analogs exhibited little cross-reactivity with the type II receptor (a 220K molecule that is not dissociated by reduction). Thus, the equal activity of native IGF-I and its recombinant DNA-produced analogs coupled with the higher potency of IGF-I (compared to IGF-II) suggest that the type II receptor plays little or no role in the four actions of the somatomedins studied in L6 myoblasts.
Output:
Affinity Labels